CVE-2023-20209: Cisco TelePresence Video Communication Server (VCS) Expressway · Code Injection
Affects Cisco TelePresence Video Communication Server (VCS) ExpresswaySource CVE Database V5
Not known to be exploited · 39% EPSS · CVSS 6.5 Medium.
Data as of 26 Oct 2026, 12:54 UTC
- EPSS
- 39.5% chance of exploitation in 30 days – higher than 98% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 16 Aug 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Cisco Cisco TelePresence Video Communication Server (VCS) Expressway | Affected
| Fixed in– |
AI-suggested
- Apply official Cisco patches immediately once they become available for all affected VCS Expressway versions.
- Restrict access to the web-based management interface to trusted networks and IP addresses using network segmentation and firewall rules.
- Enforce strong authentication and limit read-write privileges to essential personnel only to reduce the risk of credential compromise.
- Implement multi-factor authentication (MFA) for management interface access to add an additional security layer.
- Monitor logs and network traffic for unusual or unauthorized commands and access attempts to detect potential exploitation early.
- Regularly audit user accounts and permissions on the VCS Expressway devices to ensure least privilege principles.
- Consider deploying intrusion detection/prevention systems (IDS/IPS) tuned to detect command injection patterns targeting Cisco VCS.
- Educate administrators on the risks of command injection and the importance of secure management practices.
- Maintain up-to-date backups of configuration and critical data to enable rapid recovery if compromise occurs.
- Engage with Cisco support and threat intelligence sources to stay informed on emerging exploits or mitigation updates.
Description
CVE-2023-20209 is a medium severity vulnerability in Cisco TelePresence Video Communication Server (VCS) Expressway's web-based management interface. It allows an authenticated attacker with read-write privileges to perform command injection, potentially leading to remote code execution with root privileges. Exploitation requires no user interaction but does require high-level privileges on the device. The vulnerability stems from insufficient input validation in the management interface. Although no known exploits are currently in the wild, successful exploitation could severely compromise affected systems. The vulnerability affects numerous versions of Cisco VCS Expressway, widely used in enterprise video communication. European organizations using these products are at risk, especially those with critical video conferencing infrastructure. Mitigation involves applying vendor patches once available, restricting access to management interfaces, and monitoring for suspicious activity. Countries with high Cisco market penetration and strategic reliance on video communications, such as Germany, France, UK, and the Netherlands, are most likely to be impacted.