Cisco Adaptive Security Appliance (ASA) Software: Improper Handling of Extra Values
CVE-2024-20268 is a high-severity improper handling of extra values vulnerability in Cisco Adaptive Security Appliance (ASA) Software from Cisco, with a CVSS 3.1 base score of 7.7 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. Affected Cisco Adaptive Security Appliance (ASA) Software versions: 9.14.1; 9.14.1.10; 9.14.1.6, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.64% chance of exploitation within 30 days, higher than 51% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of Cisco Adaptive Security Appliance (ASA) Software you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on sec.cloudapps.cisco.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Cisco | Cisco Adaptive Security Appliance (ASA) Software | 9.14.1; 9.14.1.10; 9.14.1.6; 9.14.1.15; 9.14.1.19; 9.14.1.30; 9.15.1; 9.14.2; and 32 more ranges | Not stated |
| Cisco | Cisco Firepower Threat Defense Software | 6.6.0; 6.6.0.1; 6.6.1; 6.7.0; 6.6.3; 6.7.0.1; 6.6.4; 6.7.0.2; and 32 more ranges | Not stated |
| Cisco | Adaptive Security Appliance Software | 9.14.1; 9.14.1.6; 9.14.1.10; 9.14.1.15; 9.14.1.19; 9.14.1.30; 9.14.2; 9.14.2.4; and 32 more ranges | Not stated |
| Cisco | Secure Firewall Threat Defense | 6.6.0; 6.6.0.1; 6.6.1; 6.6.3; 6.6.4; 6.6.5; 6.6.5.1; 6.6.5.2; and 32 more ranges | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H. Scored by CNA (cisco.com).
Official description
A vulnerability in the Simple Network Management Protocol (SNMP) feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause an unexpected reload of the device. This vulnerability is due to insufficient input validation of SNMP packets. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device using IPv4 or IPv6. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. This vulnerability affects all versions of SNMP (versions 1, 2c, and 3) and requires a valid SNMP community string or valid SNMPv3 user credentials.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Improper Handling of Extra Values
The product does not handle or incorrectly handles when more values are provided than expected.
More Improper Handling of Extra Values vulnerabilities (CWE-231)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software
- 9.0 Critical severity
- 8.6 High severity
- 8.6 High severity
- 8.5 High severity
- 7.7 High severity
- 8.6 High severity
Recent Improper Handling of Extra Values vulnerabilities
- 7.5 High severity
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