Weakness (CWE)
CWE-754: Improper Check for Unusual or Exceptional Conditions
The product does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the product.
How to prevent it (7 mitigations)
-
Requirements
Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Choose languages with features such as exception handling that force the programmer to anticipate unusual conditions that may generate exceptions. Custom exceptions may need to be developed to handle unusual business-logic conditions. Be careful not to pass sensitive exceptions back to the user (CWE-209, CWE-248).
-
Implementation
Check the results of all functions that return a value and verify that the value is expected.
-
Implementation
If using exception handling, catch and throw specific exceptions instead of overly-general exceptions (CWE-396, CWE-397). Catch and handle exceptions as locally as possible so that exceptions do not propagate too far up the call stack (CWE-705). Avoid unchecked or uncaught exceptions where feasible (CWE-248).
-
Implementation
Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
Exposing additional information to a potential attacker in the context of an exceptional condition can help the attacker determine what attack vectors are most likely to succeed beyond DoS.
-
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.
-
Architecture and Design, Implementation
If the program must fail, ensure that it fails gracefully (fails closed). There may be a temptation to simply let the program fail poorly in cases such as low memory conditions, but an attacker may be able to assert control before the software has fully exited. Alternately, an uncontrolled failure could cause cascading problems with other downstream components; for example, the program could send a signal to a downstream process so the process immediately knows that a problem has occurred and has a better chance of recovery.
-
Architecture and Design
Use system limits, which should help to prevent resource exhaustion. However, the product should still handle low resource conditions since they may still occur.
Source: MITRE CWE-754
267 results · Clear filters · Feed
-
Medium 6.6
free5GC has Improper Error Handling in UDM, Leading to Information Exposure
free5gc UDM provides Unified Data Management (UDM) for free5GC, an open-source project for 5th generation (5G) mobile core networks. In versions up to and including 1.4.1, the service reliably leaks detailed internal error messages (e.g., strconv.ParseInt par…
-
Medium 6.6
PAN-OS: Denial of Service in Advanced DNS Security Feature
A denial-of-service (DoS) vulnerability in the Advanced DNS Security (ADNS) feature of Palo Alto Networks PAN-OS® software enables an unauthenticated attacker to initiate system reboots using a maliciously crafted packet. Repeated attempts to initiate a reboo…
-
Medium 4.7
Improper conditions check in some firmware for some Intel(R) NPU Drivers within Ring 1: Device Drivers may allow a deni…
-
Medium 5.5
Improper conditions check in some firmware for some Intel(R) NPU Drivers within Ring 1: Device Drivers may allow a deni…
-
Medium 6.7
Improper conditions check for the Intel(R) Optane(TM) PMem management software before versions CR_MGMT_02.00.00.4052, C…
-
Medium 5.3
Group invite - Moderately critical - Access bypass - SA-CONTRIB-2026-001
Improper Check for Unusual or Exceptional Conditions vulnerability in Drupal Group invite allows Forceful Browsing.This issue affects Group invite: from 0.0.0 before 2.3.9, from 3.0.0 before 3.0.4, from 4.0.0 before 4.0.4.
-
Medium 6.5
In wlan AP/STA firmware, there is a possible system becoming irresponsive due to an uncaught exception. This could lead…
-
Medium 6.3
Denial of Service (DoS) of VoIP Communication on TP-Link VX800v
Improper handling of exceptional conditions in VX800v v1.0 in SIP processing allows an attacker to flood the device with crafted INVITE messages, blocking all voice lines and causing a denial of service on incoming calls.
-
Medium 5.3
ASN1_TYPE Type Confusion in the PKCS7_digest_from_attributes() function
Issue summary: A type confusion vulnerability exists in the signature verification of signed PKCS#7 data where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid or NULL pointer dereference when processing malformed PK…
-
Medium 5.5
Missing ASN1_TYPE validation in PKCS#12 parsing
Issue summary: An invalid or NULL pointer dereference can happen in an application processing a malformed PKCS#12 file. Impact summary: An application processing a malformed PKCS#12 file can be caused to dereference an invalid or NULL pointer on memory read, …
-
Medium 6.9
Denial of Service in Pix-Link LV-WR21Q
A vulnerability in the Pix-Link LV-WR21Q router's language module allows remote attackers to trigger a denial of service (DoS) by sending a specially crafted HTTP POST request containing non-existing language parameter. This renders the server unable to serve…
-
Medium 5.9
go-tuf affected by client DoS via malformed server response
go-tuf is a Go implementation of The Update Framework (TUF). Starting in version 2.0.0 and prior to version 2.3.1, if the TUF repository (or any of its mirrors) returns invalid TUF metadata JSON (valid JSON but not well formed TUF metadata), the client will p…
-
Medium 6.5
Junos OS: EX4k Series, QFX5k Series: In an EVPN-VXLAN configuration link flaps cause Inter-VNI traffic drop
An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on EX4k Series and QFX5k Series platforms allows an unauthenticated network-adjacent attacker flapping an interface to cau…
-
Medium 5.8
Junos OS and Junos OS Evolved: Optional transitive BGP attribute is modified before propagation to peers causing sessions to flap
An Improper Check for Unusual or Exceptional Conditions vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, network-based attacker to cause an availability impact for downstream devic…
-
Medium 6.6
PAN-OS: Firewall Denial of Service (DoS) in GlobalProtect Gateway and Portal
A vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to cause a denial of service (DoS) to the firewall. Repeated attempts to trigger this issue results in the firewall entering into maintenance mode.
-
Medium 6.5
iccDEV has Type Confusion in CIccProfileXml::ParseBasic() at IccXML/IccLibXML/IccProfileXml.cpp
iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of International Color Consortium (ICC) color management profiles. Versions prior to 2.3.1.2 have a Type Confusion vulnerability in `CIccProfileXml::Par…
-
Medium 6.5
Improper implementation of Modbus protocol leading to DOS attack
Improper Check for Unusual or Exceptional Conditions vulnerability in ABB WebPro SNMP Card PowerValue, ABB WebPro SNMP Card PowerValue UL.This issue affects WebPro SNMP Card PowerValue: through 1.1.8.K; WebPro SNMP Card PowerValue UL: through 1.1.8.K.
-
Medium 6.5
In Modem, there is a possible system crash due to incorrect error handling. This could lead to remote denial of service…
-
Medium 5.3
CHOCO TEI WATCHER mini (IB-MCT001) contains an issue with improper check for unusual or exceptional conditions. When th…
-
Medium 4.7
WebAssembly Micro Runtime vulnerable to a segmentation fault in v128.store instruction
WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (Wasm) runtime. Prior to version 2.4.4, WAMR is susceptible to a segmentation fault in v128.store instruction. This issue has been patched in version 2.4.4.
-
Medium 6.9
Local DoS in OpenSMTPD via UNIX domain socket smtpd.sock
An Improper Check for Unusual or Exceptional Conditions vulnerability in OpenSMTPD allows local users to crash OpenSMTPD. This issue affects openSUSE Tumbleweed: from ? before 7.8.0p0-1.1.
-
Medium 5.3
Drupal core - Moderately critical - Denial of Service - SA-CORE-2025-005
Improper Check for Unusual or Exceptional Conditions vulnerability in Drupal Drupal core allows Forceful Browsing.This issue affects Drupal core: from 8.0.0 before 10.4.9, from 10.5.0 before 10.5.6, from 11.0.0 before 11.1.9, from 11.2.0 before 11.2.8.
-
Medium 6.9
ESF-IDF's ESP32 Bluetooth Controller Has an Invalid Access Address Vulnerability
ESF-IDF is the Espressif Internet of Things (IOT) Development Framework. When the ESP32 is in advertising mode, if it receives a connection request containing an invalid Access Address (AA) of 0x00000000 or 0xFFFFFFFF, advertising may stop unexpectedly. In th…
-
Medium 6.6
PAN-OS: Firewall Denial of Service (DoS) Using Specially Crafted Packets
A denial-of-service (DoS) vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to reboot a firewall by sending a specially crafted packet through the dataplane. Repeated attempts to initiate a reboot causes the firewall to e…
-
Medium 5.0
Malformed KMIP response may result in access violation
The KMIP response parser built into mongo binaries is overly tolerant of certain malformed packets, and may parse them into invalid objects. Later reads of this object can result in read access violations.
-
Medium 5.0
InventoryGui affected by item duplication in GUIs which use GuiStorageElement
InventoryGui is a library for creating chest GUIs for Bukkit/Spigot plugins. Versions 1.6.1-SNAPSHOT and earlier contain a vulnerability where any plugin using the `GuiStorageElement can allow item duplication when the experimental Bundle item feature is enab…
-
Medium 5.5
Oxford Nanopore Technologies MinKNOW Improper Check for Unusual or Exceptional Conditions
Oxford Nanopore Technologies' MinKNOW software at or prior to version 24.11 creates a temporary file to store the local authentication token during startup, before copying it to its final location. This temporary file is created in a directory accessible to a…
-
Medium 4.3
Mastodon quotes control can be bypassed
Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.…
-
Medium 6.1
Mattermost Desktop DoS when user has basic authentication server configured
Mattermost Desktop App versions <=5.13.0 fail to manage modals in the Mattermost Desktop App that stops a user with a server that uses basic authentication from accessing their server which allows an attacker that provides a malicious server to the user to de…
-
Medium 5.0
An improper check or handling of exceptional conditions vulnerability [CWE-703] in FortiOS version 7.4.0 through 7.4.3 …
-
Medium 6.5
Junos OS Evolved: PTX Series: When a firewall filter rejects traffic these packets are erroneously sent to the RE
An Improper Check for Unusual or Exceptional Conditions vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on PTX Series allows an unauthenticated, network-based attacker to cause impact to confidentiality and availabilit…
-
Medium 6.9
Kata Containers coco-tdx malicious host can circumvent initdata verification
Kata Containers is an open source project focusing on a standard implementation of lightweight Virtual Machines (VMs) that perform like containers. In Kata Containers versions from 3.20.0 and before, a malicious host can circumvent initdata verification. On T…
-
Medium 6.5
Incorrect boundary conditions in the JavaScript: GC component
Incorrect boundary conditions in the JavaScript: GC component. This vulnerability was fixed in Firefox 143, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
-
Medium 5.8
Cache exploitation vulnerability
In Content Management versions 20.4- 25.3 authenticated attackers may exploit a complex cache poisoning technique to download unprotected files from the server if the filenames are known.
-
Medium 6.0CVE-2025-9998 Public exploit
Improper validation of packets sequencing
The sequence of packets received by a Networking server are not correctly checked. An attacker could exploit this vulnerability to send specially crafted messages to force the application to stop.
-
Medium 5.9
Unexpected Input to Cloud Webhook endpoint Causes DoS in Mattermost Confluence Plugin
Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to server webhook endpoint with an invalid request body.
-
Medium 5.9
Unexpected Input to Server Webhook endpoint Causes DoS in Mattermost Confluence Plugin
Mattermost Confluence Plugin version <1.5.0 fails to handle unexpected request body which allows attackers to crash the plugin via constant hit to server webhook endpoint with an invalid request body.
-
Medium 4.4
Denial-of-service vulnerability
VMware vCenter contains a denial-of-service vulnerability. A malicious actor who is authenticated through vCenter and has permission to perform API calls for guest OS customisation may trigger this vulnerability to create a denial-of-service condition.
-
Medium 6.9
Polkadot Frontier contains missing `check_inherent` for `note_min_gas_price_target` inflates gas price
Polkadot Frontier is an Ethereum and EVM compatibility layer for Polkadot and Substrate. The extrinsic note_min_gas_price_target is an inherent extrinsic, meaning only the block producer can call it. To ensure correctness, the ProvideInherent trait should be …
-
Medium 6.9
Solady lacks extcodesize validation on implementation in ERC4337Factory
Solady is software that provides Solidity snippets with APIs. Starting in version 0.0.125 and prior to version 0.1.24, when an account is deployed via a proxy, using regular Solidity to call its initialization function may result in a silent failure, if the i…