Public proof of conceptFix available

CVE-2023-20209

Q: Is CVE-2023-20209 actively exploited?

A proof-of-concept exploit exists for CVE-2023-20209, but active exploitation has not been confirmed at this time.

Q: What is the CVSS score for CVE-2023-20209?

CVE-2023-20209 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

A public proof of concept exists; no exploitation attested.

Published2023-08-16
Fixed in14.3.1
WeaknessCWE-77 · CWE-94

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability in the web-based management interface of Cisco Expressway Series and Cisco TelePresence Video Communication Server (VCS) could allow an authenticated, remote attacker with read-write privileges on the application to perform a command injection attack that could result in remote code execution on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by sending a crafted request to the web-based management interface of an affected device. A successful exploit could allow the attacker to establish a remote shell with root privileges.

Timeline

dates in UTC

2023-08-1621:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-20209?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-20209?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Cisco telepresence video communication server

Branch	Affected	Fixed in	Source
14.3	< 14.3.1	14.3.1	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Cisco telepresence video communication server to 14.3.1

Advisories and patches

sec.cloudapps.cisco.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedpeter5he1by/CVE-2023-20209

Sources

CISA-ADPSSVC decisionpoc2024-12-03
OpenCVESSVC decisionpoc—
CNACVSS 3.16.5read 2026-10-23
NVDCVSS 3.17.2read 2026-10-23
CNAweakness (CWE)CWE-94read 2026-10-23
NVDweakness (CWE)CWE-77read 2026-10-23
FIRST EPSSEPSS score40.8 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2023-08-16
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-20209?

Is CVE-2023-20209 actively exploited?

A proof-of-concept exploit exists for CVE-2023-20209, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2023-20209?

CVE-2023-20209 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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