CVE-2024-20400: A vulnerability in the web-based management interface of Cisco Expressway Series could allow an unauthenticate

Routine

MEDIUM 4.7DOWNGRADE

CVE-2024-20400 is a medium-severity flaw (CVSS 4.7) affecting telepresence video communication server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the web-based management interface of Cisco Expressway Series could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of HTTP request parameters. An attacker could exploit this vulnerability by intercepting and modifying an HTTP request from a user. A successful exploit could allow the attacker to redirect the user to a malicious web p

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-601
Published	2024-07-17
Last modified	2026-06-17

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-07-17 17:15 UTCPublished CVE record published
2026-06-17 07:06 UTCUpdated Record last modified

cisco telepresence video communication server DOWNGRADE

Affected: x8.1 · x8.1.1 · x8.1.2 · x8.2 · x8.2.1 · x8.2.2 · x8.5 · x8.5.1

Fixed in: no fixed release known

Safe to downgrade to: a release before x8.1

1. Check installed version

apt-cache policy telepresence-video-communication-server || rpm -q telepresence-video-communication-server || telepresence-video-communication-server --version

2. No fixed release: DOWNGRADE to a release before x8.1 (Debian / Ubuntu)

apt-cache madison telepresence-video-communication-server sudo apt install telepresence-video-communication-server=<VERSION_BEFORE_x8.1> sudo apt-mark hold telepresence-video-communication-server

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list telepresence-video-communication-server sudo dnf downgrade telepresence-video-communication-server-<VERSION_BEFORE_x8.1> sudo dnf versionlock add telepresence-video-communication-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-20400?

telepresence video communication server: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-20400 being exploited?

CVE-2024-20400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-20400 affect?

CVE-2024-20400 affects telepresence video communication server. Severity is medium (CVSS 4.7). A vulnerability in the web-based management interface of Cisco Expressway Series could allow an unauthenticated, remote attacker to redirect a user to a malicious web page. This vulnerability is due to improper input validation of HTTP r

How urgent is CVE-2024-20400?

Priority 24/100. No elevated risk signals yet.

Software pages

Cisco vulnerabilities

Related CVEs

CVE-2022-20853 HIGH 7.4 DOWNGRADE A vulnerability in the REST API of Cisco Expressway Series and Cisco TelePresence VCS could allow an
CVE-2022-20814 HIGH 7.4 DOWNGRADE A vulnerability in the certificate validation of Cisco Expressway-C and Cisco TelePresence VCS could

References

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