CVE-2020-13901: An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0

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CRITICAL 9.8REMOTEUPGRADE

CVE-2020-13901 is a critical-severity flaw (CVSS 9.8) affecting janus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0. janus_sdp_merge in sdp.c has a stack-based buffer overflow.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 14%)
CISA exploited list	No
Weakness	CWE-787
Published	2020-06-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: meetecho

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

Am I affected?

Timeline

2020-06-10 22:15 UTCPublished CVE record published
2026-06-17 02:53 UTCUpdated Record last modified

meetecho janus UPGRADE

Affected: >= 0.3.0 and <= 0.10.0

Fixed in: newer than 0.10.0

Safe to downgrade to: a release before 0.3.0

1. Check installed version

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

2. UPGRADE to newer than 0.10.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade janus

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade janus

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.3.0 (Debian / Ubuntu)

apt-cache madison janus sudo apt install janus=<VERSION_BEFORE_0.3.0> sudo apt-mark hold janus

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list janus sudo dnf downgrade janus-<VERSION_BEFORE_0.3.0> sudo dnf versionlock add janus

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-2020-13901?

janus: upgrade to newer than 0.10.0. Exact commands for each OS are on this page.

Is CVE-2020-13901 being exploited?

CVE-2020-13901 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-2020-13901 affect?

CVE-2020-13901 affects janus. Severity is critical (CVSS 9.8). An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0. janus_sdp_merge in sdp.c has a stack-based buffer overflow.

How urgent is CVE-2020-13901?

Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-4124 MEDIUM 6.1 UPGRADE janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Script
CVE-2021-4020 MEDIUM 5.4 UPGRADE janus-gateway is vulnerable to Improper Neutralization of Input During Web Page Generation ('Cross-site Script
CVE-2020-14034 CRITICAL 9.8 UPGRADE An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0
CVE-2020-14033 CRITICAL 9.8 UPGRADE An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0
CVE-2020-13900 HIGH 7.5 UPGRADE An issue was discovered in janus-gateway (aka Janus WebRTC Server) through 0.10.0

References

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