Weakness (CWE)
CWE-134: Use of Externally-Controlled Format String
The product uses a function that accepts a format string as an argument, but the format string originates from an external source.
How to prevent it (3 mitigations)
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Requirements
Choose a language that is not subject to this flaw.
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Implementation
Ensure that all format string functions are passed a static string which cannot be controlled by the user, and that the proper number of arguments are always sent to that function as well. If at all possible, use functions that do not support the %n operator in format strings. [REF-116] [REF-117]
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Build and Compilation
Run compilers and linkers with high warning levels, since they may detect incorrect usage.
Source: MITRE CWE-134
185 results · Feed
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High 7.0
Authenticated Format String Injection on TP-Link Tapo C110
An authenticated format string vulnerability exists in the ONVIF service of Tapo C110 v2 due to improper handling of user-controlled input. Externally controlled data is interpreted as a format string, which can be used to manipulate stack memory, including …
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Medium 6.8
Authenticated Format String Vulnerability in ONVIF Subscribe Service on TP-Link Tapo C520WS
An authenticated format string vulnerability exists in the ONVIF Subscribe service in Tapo C520WS v2 due to improper handling of externally supplied parameters within formatting functions. An attacker may inject crafted format strings into event subscription …
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Medium 6.8
Authenticated Format String Vulnerability in ONVIF AddScopes Method on TP-Link Tapo C520WS
An authenticated format string vulnerability is present in the ONVIF AddScopes in Tapo C520WS v2, where user-controlled input is improperly passed to formatting functions without adequate sanitization. An attacker can inject format specifiers into ONVIF scope…
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High 8.8
Exposed Factory Testing App Boundaries
Leftover engineering diagnostics and factory-level diagnostic software remain exposed on retail builds, giving malicious apps write privileges to internal NVRAM registers.
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Low 3.1
Format string argument mismatch
A format string argument mismatch in Netatalk 3.0.3 through 4.4.2 allows a remote authenticated attacker to cause a minor denial of service via crafted input that triggers incorrect format string processing.
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Medium 4.3
PostgreSQL timeofday() can disclose portions of server memory
Externally-controlled format string in PostgreSQL timeofday() function allows an attacker to retrieve portions of server memory, via crafted timezone zones. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.
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Medium 4.7
Remote Denial of Service Vulnerability Exists in ZTE Cloud PC Client uSmartview
A remote denial-of-service vulnerability exists in the ZTE Cloud PC client uSmartview, which may lead to memory corruption and remote denial of service.
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Medium 4.4
Notepad++ 8.9.3 Format String Injection via nativeLang.xml
Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute …
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Medium 6.6CVE-2026-3008 Public exploit
Vulnerability in Notepad++
Successful exploitation of the string injection vulnerability could allow an attacker to obtain memory address information or crash the application.
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Medium 5.5
Nano: nano: format string vulnerability leads to denial of service
A flaw was found in nano. A local user could exploit a format string vulnerability in the `statusline()` function. By creating a directory with a name containing `printf` specifiers, the application attempts to display this name, leading to a segmentation fau…
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High 7.5
CODESYS Control Audit Log Format String DoS
An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.
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High 8.3
Ruby JSON has a format string injection vulnerability
Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false pa…
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Medium 6.5
A use of externally-controlled format string vulnerability in Fortinet FortiAnalyzer 7.6.0 through 7.6.4, FortiAnalyzer…
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Medium 4.9
A post-authentication Format String vulnerability in SonicOS allows a remote attacker to crash a firewall.
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Low 0.6
Qsync Central
A use of externally-controlled format string vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to obtain secret data or modify memory. We have already fixed the vulnerab…
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Medium 6.7
A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 throu…
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Low 2.7
HackerOne community member Faraz Ahmed (PakCyberbot) has reported a format string injection in the Revive Adserver sett…
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Medium 5.3
n8n has a Webhook Node IP Whitelist Bypass via Partial String Matching
n8n is an open source workflow automation platform. From 1.36.0 to before 2.2.0, the Webhook node’s IP whitelist validation performed partial string matching instead of exact IP comparison. As a result, an incoming request could be accepted if the source IP a…
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Unscored —
net/mlx5: fw_tracer, Validate format string parameters
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: fw_tracer, Validate format string parameters Add validation for format string parameters in the firmware tracer to prevent potential security vulnerabilities and crashes from malfor…
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Medium 5.1
Panda3D <= 1.10.16 egg-mkfont Format String Information Disclosure
The egg-mkfont utility in Panda3D versions up to and including 1.10.16 contains an uncontrolled format string vulnerability. The -gp (glyph pattern) command-line option is used directly as the format string for sprintf() with only a single argument supplied. …
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Low 1.2
QTS, QuTS hero
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.…
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Critical 9.8
SOUND4 LinkAndShare Transmitter 1.1.2 Format String Stack Buffer Overflow
SOUND4 LinkAndShare Transmitter 1.1.2 contains a format string vulnerability that allows attackers to trigger memory stack overflows through maliciously crafted environment variables. Attackers can manipulate the username environment variable with format stri…
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Low 2.7
Improper neutralisation of format characters in the settings of Revive Adserver 5.5.2 and 6.0.1 and earlier versions ca…
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High 8.8
A format string vulnerability exists in the formPingCmd functionality of Planet WGR-500 v1.3411b190912. A specially cra…
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Medium 5.1
QTS, QuTS hero
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.…
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Medium 5.1
QTS, QuTS hero
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.…
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Medium 5.1
QTS, QuTS hero
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.…
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Medium 5.1
QTS, QuTS hero
A use of externally-controlled format string vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to obtain secret data or modify memory.…
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High 7.5
IBM webMethods Integration code execution
IBM webMethods Integration 10.15 and 11.1 could allow an authenticated user with required execute Services to execute commands on the system due to the improper validation of format string strings passed as an argument from an external source.
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High 8.4CVE-2010-10017 Public exploit
WM Downloader 3.1.2.2 Buffer Overflow via Malformed M3U File
WM Downloader version 3.1.2.2 is vulnerable to a buffer overflow when processing a specially crafted .m3u playlist file. The application fails to properly validate input length, allowing an attacker to overwrite structured exception handler (SEH) records and …
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High 7.5
ImageMagick Format String Bug in InterpretImageFilename leads to arbitrary code execution
ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to ImageMagick versions 6.9.13-28 and 7.1.2-2, a format string bug vulnerability exists in InterpretImageFilename function where user input is directly passed…
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High 8.7CVE-2011-10029 Public exploit
Solar FTP Server <= 2.1.1 Malformed USER Denial of Service
Solar FTP Server fails to properly handle format strings passed to the USER command. When a specially crafted string containing format specifiers is sent, the server crashes due to a read access violation in the __output_1() function of sfsservice.exe. This r…
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Critical 9.3CVE-2012-10055 Public exploit
ComSndFTP v1.3.7 Beta USER Format String RCE
ComSndFTP FTP Server version 1.3.7 Beta contains a format string vulnerability in its handling of the USER command. By sending a specially crafted username containing format specifiers, a remote attacker can overwrite a hardcoded function pointer in memory (s…
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Critical 9.8
Use of Externally-Controlled Format String vulnerability in the SonicOS SSL VPN interface allows a remote unauthenticat…
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High 7.2
An issue was discovered in CommScope Ruckus Unleashed prior to 200.15.6.212.14 and 200.17.7.0.139, and in Ruckus ZoneDi…
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Critical 9.8
An issue was discovered in CommScope Ruckus Unleashed prior to 200.15.6.212.14 and 200.17.7.0.139, where the functions …
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Low 2.3
Qsync Central
A use of externally-controlled format string vulnerability has been reported to affect Qsync Central. If exploited, the vulnerability could allow remote attackers who have gained user access to obtain secret data or modify memory. We have already fixed the vu…
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High 7.0
FreeScout Has Insufficient Protection Against CRLF-injection
FreeScout is a free self-hosted help desk and shared mailbox. Prior to version 1.8.178, the application performs insufficient validation of user-supplied data, which is used as arguments to string formatting functions. As a result, an attacker can pass a stri…
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High 7.0
A use of externally-controlled format string vulnerability [CWE-134] in FortiOS version 7.4.0 through 7.4.4, version 7.…
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Medium 5.5
An XML External Entity (XXE) vulnerability in the deserializeArgs() method of Java SDK for CloudEvents v4.0.1 allows at…