Cisco Analog Telephone Adaptor (ATA) Software: Authentication Bypass by Primary Weakness
CVE-2024-20463 is a high-severity authentication bypass by primary weakness vulnerability in Cisco Analog Telephone Adaptor (ATA) Software from Cisco, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. Affected Cisco Analog Telephone Adaptor (ATA) Software versions: 12.0.1 SR2; 11.1.0; 12.0.1 SR1, 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 0.38% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Ata 191 Firmware to 12.0.2 or 11.2.5, whichever matches your release line, or a later version.
- Update Ata 192 Firmware to 11.2.5 or a later version.
- Read the advisory on sec.cloudapps.cisco.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Cisco | Cisco Analog Telephone Adaptor (ATA) Software | 12.0.1 SR2; 11.1.0; 12.0.1 SR1; 11.1.0 MSR1; 12.0.1; 11.1.0 MSR2; 11.1.0 MSR3; 11.1.0 MSR4; and 8 more ranges | Not stated |
| Cisco | Ata 191 Firmware | before 12.0.2; before 11.2.5 | 12.0.2, 11.2.5 |
| Cisco | Ata 192 Firmware | before 11.2.5 | 11.2.5 |
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
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- LowLimited modification of data is possible.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 5.4 | Medium | CNA (cisco.com) |
| CVSS 3.1 | 7.1 | High | NVD |
Official description
A vulnerability in the web-based management interface of Cisco ATA 190 Series Analog Telephone Adapter firmware could allow an unauthenticated, remote attacker to modify the configuration or reboot an affected device. This vulnerability is due to the HTTP server allowing state changes in GET requests. An attacker could exploit this vulnerability by sending a malicious request to the web-based management interface on an affected device. A successful exploit could allow the attacker to make limited modifications to the configuration or reboot the device, resulting in a denial of service (DoS) condition.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authentication Bypass by Primary Weakness
The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.
More Authentication Bypass by Primary Weakness vulnerabilities (CWE-305)
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 Analog Telephone Adaptor (ATA) Software
- 7.2 High severity
- 8.2 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
Recent Authentication Bypass by Primary Weakness vulnerabilities
- 8.8 High severity
- 7.3 High severity
- 9.8 Critical severity
- 7.5 High severity
- 7.3 High severity
- 7.5 High severity
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