CVE-2022-20968
Published: 12 December 2022
Summary
CVE-2022-20968 is a high-severity Out-of-bounds Write (CWE-787) vulnerability in Cisco Ip Phone 7811 Firmware. Its CVSS base score is 8.1 (High).
Operationally, ranked in the top 7.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
A vulnerability in the Cisco Discovery Protocol processing feature of Cisco IP Phone 7800 and 8800 Series firmware stems from insufficient input validation of received Cisco Discovery Protocol packets. The flaw, tracked as CVE-2022-20968 with a CVSS score of 8.1 and CWE-787, can trigger a stack overflow on affected devices.
An unauthenticated adjacent attacker can exploit the issue by sending crafted Cisco Discovery Protocol traffic, achieving remote code execution or a denial of service condition on the target phone.
The referenced Cisco Security Advisory provides official details on the vulnerability and associated remediation steps. The EPSS score reached a peak of 0.1016 before receding to the current value of 0.0798, indicating limited sustained exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-26218
Vulnerability details
A vulnerability in the Cisco Discovery Protocol processing feature of Cisco IP Phone 7800 and 8800 Series firmware could allow an unauthenticated, adjacent attacker to cause a stack overflow on an affected device. This vulnerability is due to insufficient input…
more
validation of received Cisco Discovery Protocol packets. An attacker could exploit this vulnerability by sending crafted Cisco Discovery Protocol traffic to an affected device. A successful exploit could allow the attacker to cause a stack overflow, resulting in possible remote code execution or a denial of service (DoS) condition on an affected device.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.