Common Weakness Enumeration
CWE-754
Allowed-with-ReviewImproper Check for Unusual or Exceptional Conditions
Abstraction: Class · Status: Incomplete
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.
905 vulnerabilities reference this CWE, most recent first.
CVE-2020-1999 (GCVE-0-2020-1999)
Vulnerability from cvelistv5 – Published: 2020-11-12 00:05 – Updated: 2024-09-17 01:15
VLAI
EPSS
VEX
Title
PAN-OS: Threat signatures are evaded by specifically crafted packets
Summary
A vulnerability exists in the Palo Alto Network PAN-OS signature-based threat detection engine that allows an attacker to communicate with devices in the network in a way that is not analyzed for threats by sending data through specifically crafted TCP packets. This technique evades signature-based threat detection. This issue impacts: PAN-OS 8.1 versions earlier than 8.1.17; PAN-OS 9.0 versions earlier than 9.0.11; PAN-OS 9.1 versions earlier than 9.1.5; All versions of PAN-OS 7.1 and PAN-OS 8.0.
Severity
5.3 (Medium)
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://security.paloaltonetworks.com/CVE-2020-1999 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Palo Alto Networks | PAN-OS |
Affected:
7.1.*
Affected: 8.0.* Unaffected: 10.0.* Affected: 8.1 , < 8.1.17 (custom) Affected: 9.0 , < 9.0.11 (custom) Affected: 9.1 , < 9.1.5 (custom) |
Date Public
2020-11-11 00:00
Credits
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CVE-2019-15989 (GCVE-0-2019-15989)
Vulnerability from cvelistv5 – Published: 2020-01-26 04:30 – Updated: 2024-11-15 17:46
VLAI
EPSS
VEX
Title
Cisco IOS XR Software Border Gateway Protocol Attribute Denial of Service Vulnerability
Summary
A vulnerability in the implementation of the Border Gateway Protocol (BGP) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to incorrect processing of a BGP update message that contains a specific BGP attribute. An attacker could exploit this vulnerability by sending BGP update messages that include a specific, malformed attribute to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit this vulnerability, the malicious BGP update message would need to come from a configured, valid BGP peer or would need to be injected by the attacker into the victim’s BGP network on an existing, valid TCP connection to a BGP peer.
Severity
8.6 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://tools.cisco.com/security/center/content/C… | vendor-advisoryx_refsource_CISCO |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cisco | Cisco IOS XR Software |
Affected:
unspecified , < n/a
(custom)
|
Date Public
2020-01-22 00:00
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CVE-2019-11779 (GCVE-0-2019-11779)
Vulnerability from cvelistv5 – Published: 2019-09-19 13:30 – Updated: 2024-08-04 23:03
VLAI
EPSS
VEX
Summary
In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.
Severity
No CVSS data available.
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://bugs.eclipse.org/bugs/show_bug.cgi?id=551160 | x_refsource_CONFIRM |
| https://usn.ubuntu.com/4137-1/ | vendor-advisoryx_refsource_UBUNTU |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| http://lists.opensuse.org/opensuse-security-annou… | vendor-advisoryx_refsource_SUSE |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2019… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2019/dsa-4570 | vendor-advisoryx_refsource_DEBIAN |
| https://seclists.org/bugtraq/2019/Nov/25 | mailing-listx_refsource_BUGTRAQ |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| The Eclipse Foundation | Eclipse Mosquitto |
Affected:
1.5.0 to 1.6.5 inclusive
|
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CVE-2019-6857 (GCVE-0-2019-6857)
Vulnerability from cvelistv5 – Published: 2020-01-06 22:57 – Updated: 2026-05-29 14:41
VLAI
EPSS
VEX
Summary
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service of the controller when reading specific memory blocks using Modbus TCP.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.se.com/ww/en/download/document/SEVD-2… | x_refsource_CONFIRM |
| https://www.us-cert.gov/ics/advisories/icsa-20-016-01 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Schneider Electric SE | Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) |
Affected:
Modicon M580
Affected: Modicon M340 Affected: Modicon Quantum Affected: Modicon Premium (see security notification for specific versions) |
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CVE-2019-6856 (GCVE-0-2019-6856)
Vulnerability from cvelistv5 – Published: 2020-01-06 22:57 – Updated: 2026-05-29 14:37
VLAI
EPSS
VEX
Summary
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.se.com/ww/en/download/document/SEVD-2… | x_refsource_CONFIRM |
| https://www.us-cert.gov/ics/advisories/icsa-20-016-01 | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Schneider Electric SE | Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) |
Affected:
Modicon M580
Affected: Modicon M340 Affected: Modicon Quantum Affected: Modicon Premium (see security notification for specific versions) |
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CVE-2019-6833 (GCVE-0-2019-6833)
Vulnerability from cvelistv5 – Published: 2019-09-17 19:36 – Updated: 2025-09-30 14:36
VLAI
EPSS
VEX
Summary
A CWE-754 – Improper Check for Unusual or Exceptional Conditions vulnerability exists in Magelis HMI Panels (all versions of - HMIGTO, HMISTO, XBTGH, HMIGTU, HMIGTUX, HMISCU, HMISTU, XBTGT, XBTGT, HMIGXO, HMIGXU), which could cause a temporary freeze of the HMI when a high rate of frames is received. When the attack stops, the buffered commands are processed by the HMI panel.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-754 - – Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.schneider-electric.com/ww/en/download… | x_refsource_CONFIRM |
| https://security.cse.iitk.ac.in/responsible-disclosure | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Schneider Electric SE | Magelis HMI Panels |
Affected:
all versions of HMIGTO
Affected: all versions of HMISTO Affected: all versions of XBTGH Affected: all versions of HMIGTU Affected: all versions of HMIGTUX Affected: all versions of HMISCU Affected: all versions of HMISTU Affected: all versions of XBTGT Affected: all versions of HMIGXO Affected: all versions of HMIGXU |
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CVE-2019-6831 (GCVE-0-2019-6831)
Vulnerability from cvelistv5 – Published: 2019-09-17 19:22 – Updated: 2024-08-04 20:31
VLAI
EPSS
VEX
Summary
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions), which could cause disconnection of active connections when an unusually high number of IEC 60870- 5-104 packets are received by the module on port 2404/TCP.
Severity
No CVSS data available.
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.schneider-electric.com/en/download/do… | x_refsource_CONFIRM |
| https://security.cse.iitk.ac.in/responsible-disclosure | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Schneider Electric SE | BMXNOR0200H Ethernet / Serial RTU module |
Affected:
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CVE-2019-6819 (GCVE-0-2019-6819)
Vulnerability from cvelistv5 – Published: 2019-05-22 19:45 – Updated: 2026-05-29 14:30
VLAI
EPSS
VEX
Summary
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists which could cause a possible Denial of Service when specific Modbus frames are sent to the controller in the products: Modicon M340 - firmware versions prior to V3.01, Modicon M580 - firmware versions prior to V2.80, All firmware versions of Modicon Quantum and Modicon Premium.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://www.schneider-electric.com/en/download/do… | x_refsource_MISC |
| http://www.securityfocus.com/bid/109004 | vdb-entryx_refsource_BID |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | Modicon Controllers, Modicon M340 - firmware versions prior to V3.01 Modicon M580 - firmware versions prior to V2.80 All firmware versions of Modicon Quantum and Modicon Premium |
Affected:
Modicon Controllers, Modicon M340 - firmware versions prior to V3.01 Modicon M580 - firmware versions prior to V2.80 All firmware versions of Modicon Quantum and Modicon Premium
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CVE-2019-6813 (GCVE-0-2019-6813)
Vulnerability from cvelistv5 – Published: 2019-09-17 19:56 – Updated: 2024-08-04 20:31
VLAI
EPSS
VEX
Summary
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in BMXNOR0200H Ethernet / Serial RTU module (all firmware versions) and Modicon M340 controller (all firmware versions), which could cause denial of service when truncated SNMP packets on port 161/UDP are received by the device.
Severity
No CVSS data available.
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.schneider-electric.com/en/download/do… | x_refsource_CONFIRM |
| https://www.schneider-electric.com/en/download/do… | x_refsource_CONFIRM |
| https://security.cse.iitk.ac.in/responsible-disclosure | x_refsource_MISC |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| CVE-2019-6813 | BMXNOR0200H Ethernet / Serial RTU module |
Affected:
all firmware versions
|
|
| CVE-2019-6813 | Modicon M340 controller |
Affected:
all firmware versions
|
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CVE-2019-6811 (GCVE-0-2019-6811)
Vulnerability from cvelistv5 – Published: 2019-09-17 19:55 – Updated: 2024-08-04 20:31
VLAI
EPSS
VEX
Summary
An Improper Check for Unusual or Exceptional Conditions (CWE-754) vulnerability exists in Modicon Quantum 140 NOE771x1 version 6.9 and earlier, which could cause denial of service when the module receives an IP fragmented packet with a length greater than 65535 bytes. The module then requires a power cycle to recover.
Severity
No CVSS data available.
CWE
- CWE-754 - Improper Check for Unusual or Exceptional Conditions (CWE-754)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.schneider-electric.com/en/download/do… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Schneider Electric SE | Modicon Quantum 140 NOE771x1 |
Affected:
version 6.9 and earlier
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Mitigation MIT-3
Requirements
Strategy: Language Selection
- 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).
Mitigation
Implementation
Check the results of all functions that return a value and verify that the value is expected.
Mitigation
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).
Mitigation MIT-39
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.
Mitigation MIT-5
Implementation
Strategy: Input Validation
- 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.
Mitigation MIT-38
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.
Mitigation
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.
No CAPEC attack patterns related to this CWE.