Weakness (CWE)
CWE-120: Buffer Copy without Checking Size of Input
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.
How to prevent it (8 mitigations)
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Requirements
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
For example, many languages that perform their own memory management, such as Java and Perl, are not subject to buffer overflows. Other languages, such as Ada and C#, typically provide overflow protection, but the protection can be disabled by the programmer.
Be wary that a language's interface to native code may still be subject to overflows, even if the language itself is theoretically safe.
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Architecture and Design
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Examples include the Safe C String Library (SafeStr) by Messier and Viega [REF-57], and the Strsafe.h library from Microsoft [REF-56]. These libraries provide safer versions of overflow-prone string-handling functions.
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Operation, Build and Compilation
Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
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Implementation
Consider adhering to the following rules when allocating and managing an application's memory:
- Double check that your buffer is as large as you specify.
- When using functions that accept a number of bytes to copy, such as strncpy(), be aware that if the destination buffer size is equal to the source buffer size, it may not NULL-terminate the string.
- Check buffer boundaries if accessing the buffer in a loop and make sure there is no danger of writing past the allocated space.
- If necessary, truncate all input strings to a reasonable length before passing them to the copy and concatenation functions.
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Implementation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
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Architecture and Design
For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
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Operation, Build and Compilation
Run or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as "rebasing" (for Windows) and "prelinking" (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].
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Operation
Use a CPU and operating system that offers Data Execution Protection (using hardware NX or XD bits) or the equivalent techniques that simulate this feature in software, such as PaX [REF-60] [REF-61]. These techniques ensure that any instruction executed is exclusively at a memory address that is part of the code segment.
For more information on these techniques see D3-PSEP (Process Segment Execution Prevention) from D3FEND [REF-1336].
Source: MITRE CWE-120
3,303 results · Feed
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High 8.8
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Medium 5.9
Junos OS: SRX Series and MX Series: Receipt of specific SIP packets in a high utilization situation causes a flowd/mspmand crash
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High 7.8
Buffer Copy Without Checking Size of Input in Camera
memory corruption while processing an image encoding completion event.
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High 8.8
TOTOLINK N600R HTTP Request cstecgi.cgi setWiFiBasicConfig buffer overflow
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High 8.8
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A security vulnerability has been detected in D-Link DI-7001 MINI 24.04.18B1. The affected element is an unknown function of the file /dbsrv.asp. Such manipulation of the argument str leads to buffer overflow. The attack may be launched remotely. The exploit …
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High 8.8
Tenda AC20 fast_setting_wifi_set sscanf buffer overflow
A vulnerability has been found in Tenda AC20 up to 16.03.08.12. The affected element is the function sscanf of the file /goform/fast_setting_wifi_set. The manipulation of the argument timeZone leads to buffer overflow. The attack can be initiated remotely. Th…
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High 8.8
Tenda AC23 SetStaticRouteCfg sscanf buffer overflow
A vulnerability was found in Tenda AC23 up to 16.03.07.52. Affected by this issue is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. It is possible to launch the attack remotely. The…
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High 8.8
UTT 1250GW aspChangeChannel strcpy buffer overflow
A vulnerability has been found in UTT 1250GW up to v2v3.2.2-200710. Affected by this vulnerability is the function strcpy of the file /goform/aspChangeChannel. The manipulation of the argument pvid leads to buffer overflow. It is possible to initiate the atta…
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High 8.8
D-Link DI-7100G C1 jhttpd hi_block.asp sub_4BD4F8 buffer overflow
A vulnerability has been found in D-Link DI-7100G C1 up to 20250928. This issue affects the function sub_4BD4F8 of the file /webchat/hi_block.asp of the component jhttpd. The manipulation of the argument popupId leads to buffer overflow. The attack can be ini…
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High 8.8
D-Link DI-7100G C1 jhttpd login.cgi sub_4C0990 buffer overflow
A flaw has been found in D-Link DI-7100G C1 up to 20250928. This vulnerability affects the function sub_4C0990 of the file /webchat/login.cgi of the component jhttpd. Executing manipulation of the argument openid can lead to buffer overflow. It is possible to…
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High 8.8
UTT 1250GW formUserStatusRemark strcpy buffer overflow
A vulnerability was determined in UTT 1250GW up to v2v3.2.2-200710. Affected is the function strcpy of the file /goform/formUserStatusRemark. This manipulation of the argument Username causes buffer overflow. Remote exploitation of the attack is possible. The…
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High 8.8
UTT HiPER 840G formTaskEdit strcpy buffer overflow
A vulnerability has been found in UTT HiPER 840G up to 3.1.1-190328. Affected by this issue is the function strcpy of the file /goform/formTaskEdit. The manipulation of the argument txtMin2 leads to buffer overflow. Remote exploitation of the attack is possib…
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High 8.8
Belkin F9K1015 formWpsStart buffer overflow
A security vulnerability has been detected in Belkin F9K1015 1.00.10. This impacts an unknown function of the file /goform/formWpsStart. Such manipulation of the argument pinCode leads to buffer overflow. The attack can be launched remotely. The exploit has b…
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High 8.8
Belkin F9K1015 formWlanSetupWPS buffer overflow
A weakness has been identified in Belkin F9K1015 1.00.10. This affects an unknown function of the file /goform/formWlanSetupWPS. This manipulation of the argument webpage causes buffer overflow. The attack can be initiated remotely. The exploit has been made …
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High 8.8
Belkin F9K1015 formWlanMP buffer overflow
A security flaw has been discovered in Belkin F9K1015 1.00.10. The impacted element is an unknown function of the file /goform/formWlanMP. The manipulation of the argument ateFunc results in buffer overflow. It is possible to launch the attack remotely. The e…
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High 8.8
Belkin F9K1015 formWanTcpipSetup buffer overflow
A vulnerability was identified in Belkin F9K1015 1.00.10. The affected element is an unknown function of the file /goform/formWanTcpipSetup. The manipulation of the argument pppUserName leads to buffer overflow. It is possible to initiate the attack remotely.…
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High 8.8
Belkin F9K1015 formSetLanguage buffer overflow
A vulnerability was found in Belkin F9K1015 1.00.10. This issue affects some unknown processing of the file /goform/formSetLanguage. Performing a manipulation of the argument webpage results in buffer overflow. The attack is possible to be carried out remotel…
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High 8.8
Belkin F9K1015 formPPTPSetup buffer overflow
A vulnerability has been found in Belkin F9K1015 1.00.10. This vulnerability affects unknown code of the file /goform/formPPTPSetup. Such manipulation of the argument pptpUserName leads to buffer overflow. The attack can be executed remotely. The exploit has …
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High 8.8
Belkin F9K1015 formPPPoESetup buffer overflow
A flaw has been found in Belkin F9K1015 1.00.10. This affects an unknown part of the file /goform/formPPPoESetup. This manipulation of the argument pppUserName causes buffer overflow. Remote exploitation of the attack is possible. The exploit has been publish…
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High 8.8
Belkin F9K1015 formL2TPSetup buffer overflow
A vulnerability was detected in Belkin F9K1015 1.00.10. Affected by this issue is some unknown functionality of the file /goform/formL2TPSetup. The manipulation of the argument L2TPUserName results in buffer overflow. The attack may be launched remotely. The …
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High 8.8
Belkin F9K1015 formConnectionSetting buffer overflow
A security vulnerability has been detected in Belkin F9K1015 1.00.10. Affected by this vulnerability is an unknown functionality of the file /goform/formConnectionSetting. The manipulation of the argument max_Conn leads to buffer overflow. The attack may be i…
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Medium 5.5
SPDK is vulnerable to buffer overflow in the NVMe-oF target component
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High 8.8
Tenda AC8 SetServerConfig formSetServerConfig buffer overflow
A weakness has been identified in Tenda AC8 16.03.34.06. The affected element is the function formSetServerConfig of the file /goform/SetServerConfig. Executing manipulation can lead to buffer overflow. It is possible to launch the attack remotely. The exploi…
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High 8.8
Tenda CH22 GstDhcpSetSer formWrlExtraGet buffer overflow
A vulnerability was determined in Tenda CH22 1.0.0.1. This vulnerability affects the function formWrlExtraGet of the file /goform/GstDhcpSetSer. This manipulation of the argument dips causes buffer overflow. The attack is possible to be carried out remotely. …
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High 8.8
Tenda AC21 SetStaticRouteCfg sscanf buffer overflow
A security flaw has been discovered in Tenda AC21 up to 16.03.08.16. Affected by this vulnerability is the function sscanf of the file /goform/SetStaticRouteCfg. The manipulation of the argument list results in buffer overflow. The attack can be launched remo…
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High 8.8
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Critical 9.9
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High 8.8
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High 8.8
MikroTik RouterOS libjson.so print parse_json_element buffer overflow
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High 8.8
H3C Magic B3 aspForm EditMacList buffer overflow
A vulnerability was identified in H3C Magic B3 up to 100R002. This affects the function AddMacList/EditMacList of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. The attack can be initiated remotely. The exploit is p…
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High 7.5
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Medium 6.5
A vulnerability in the CLI of Cisco IOS Software and Cisco IOS XE Software could allow an authenticated, local attacker…
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High 7.8
Buffer Copy Without Checking Size of Input in HLOS
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High 7.8
Buffer Copy Without Checking Size of Input in Computer Vision
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Critical 10.0
Unauthenticated Buffer Overflow
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High 8.8
Tenda AC21 WifiExtraSet sub_45BB10 buffer overflow
A vulnerability was identified in Tenda AC21 16.03.08.16. The affected element is the function sub_45BB10 of the file /goform/WifiExtraSet. The manipulation of the argument wpapsk_crypto leads to buffer overflow. It is possible to initiate the attack remotely…
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High 8.8
Tenda AC20 HTTP POST Request SetPptpServerCfg strcpy buffer overflow
A vulnerability was identified in Tenda AC20 up to 16.03.08.12. Affected by this issue is the function strcpy of the file /goform/SetPptpServerCfg of the component HTTP POST Request Handler. Such manipulation of the argument startIp leads to buffer overflow. …
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High 7.8
PRT File Parsing Memory Corruption Vulnerability
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High 8.8
Tenda AC23 HTTP POST Request SetPptpServerCfg sscanf buffer overflow
A vulnerability has been found in Tenda AC23 up to 16.03.07.52. Affected by this vulnerability is the function sscanf of the file /goform/SetPptpServerCfg of the component HTTP POST Request Handler. Such manipulation of the argument startIp leads to buffer ov…
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High 8.8
D-Link DIR-513 formWPS buffer overflow
A security vulnerability has been detected in D-Link DIR-513 A1FW110. Affected is an unknown function of the file /goform/formWPS. Such manipulation of the argument webpage leads to buffer overflow. The attack may be performed from remote. The exploit has bee…