What is CVE-2023-20079?

CVE-2023-20079 is a critical-severity vulnerability in Cisco Ip Phones With Multiplatform Firmware, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2023-03-03.

How severe is CVE-2023-20079?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Cisco Ip Phones With Multiplatform Firmware

CVE-2023-20079

Multiple vulnerabilities in the web-based management interface of certain Cisco IP Phones could allow an unauthenticated, remote attacker to execute arbitrary code or cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.

Vulnerability class: Buffer Overflow

Published 2023-03-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.103 (95.7th percentile), scored 2026-10-20.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 95.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.103 · newest: 0.103 · change: 0.000

Affected products

Weakness classification (CWE)

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2023-20079?: CVE-2023-20079 is a critical-severity vulnerability in Cisco Ip Phones With Multiplatform Firmware, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2023-03-03.
How severe is CVE-2023-20079?: Critical severity. CVSS v3 base score is 9.8 out of 10.