CVE-2024-21855: A lack of authentication vulnerability exists in the HTTP API functionality of GoCast 1.1.3

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2024-21855 is a critical-severity flaw (CVSS 9.8) affecting gocast. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A lack of authentication vulnerability exists in the HTTP API functionality of GoCast 1.1.3. A specially crafted HTTP request can lead to arbitrary command execution. An attacker can make an unauthenticated HTTP request to trigger this vulnerability.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-306
Published	2024-11-21
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: mayuresh82

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

Am I affected?

Timeline

2024-11-21 15:15 UTCPublished CVE record published
2026-06-17 07:10 UTCUpdated Record last modified

mayuresh82 gocast DOWNGRADE

Affected: 1.1.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.1.3

1. Check installed version

apt-cache policy gocast || rpm -q gocast || gocast --version

2. No fixed release: DOWNGRADE to a release before 1.1.3 (Debian / Ubuntu)

apt-cache madison gocast sudo apt install gocast=<VERSION_BEFORE_1.1.3> sudo apt-mark hold gocast

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

dnf --showduplicates list gocast sudo dnf downgrade gocast-<VERSION_BEFORE_1.1.3> sudo dnf versionlock add gocast

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-2024-21855?

gocast: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-21855 being exploited?

CVE-2024-21855 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-2024-21855 affect?

CVE-2024-21855 affects gocast. Severity is critical (CVSS 9.8). A lack of authentication vulnerability exists in the HTTP API functionality of GoCast 1.1.3. A specially crafted HTTP request can lead to arbitrary command execution. An attacker can make an unauthenticated HTTP request to trigger this vuln

How urgent is CVE-2024-21855?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-29224 CRITICAL 9.8 DOWNGRADE An OS command injection vulnerability exists in the NAT parameter of GoCast 1.1.3
CVE-2024-28892 CRITICAL 9.8 DOWNGRADE An OS command injection vulnerability exists in the name parameter of GoCast 1.1.3

References

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