CVE-2021-28681: Pion WebRTC before 3.0.15 didn't properly tear down the DTLS Connection when certificate verification failed

Q: How do I fix CVE-2021-28681?

webrtc: upgrade to 3.0.15. Exact commands for each OS are on this page.

Q: Is CVE-2021-28681 being exploited?

CVE-2021-28681 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-28681 affect?

CVE-2021-28681 affects webrtc. Severity is medium (CVSS 5.3). Pion WebRTC before 3.0.15 didn't properly tear down the DTLS Connection when certificate verification failed. The PeerConnectionState was set to failed, but a user could ignore that and continue to use the PeerConnection. )A WebRTC implemen

Q: How urgent is CVE-2021-28681?

Priority 42/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.3REMOTEUPGRADE

CVE-2021-28681 is a medium-severity flaw (CVSS 5.3) affecting webrtc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Pion WebRTC before 3.0.15 didn't properly tear down the DTLS Connection when certificate verification failed. The PeerConnectionState was set to failed, but a user could ignore that and continue to use the PeerConnection. )A WebRTC implementation shouldn't allow the user to continue if verification has failed.)

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-863
Published	2021-03-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: webrtc project

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

Am I affected?

Timeline

2021-03-18 04:15 UTCPublished CVE record published
2026-06-17 03:46 UTCUpdated Record last modified

webrtc project webrtc UPGRADE

Affected: < 3.0.15

Fixed in: 3.0.15

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 3.0.15 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade webrtc

Note

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

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-2021-28681?

webrtc: upgrade to 3.0.15. Exact commands for each OS are on this page.

Is CVE-2021-28681 being exploited?

CVE-2021-28681 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-2021-28681 affect?

CVE-2021-28681 affects webrtc. Severity is medium (CVSS 5.3). Pion WebRTC before 3.0.15 didn't properly tear down the DTLS Connection when certificate verification failed. The PeerConnectionState was set to failed, but a user could ignore that and continue to use the PeerConnection. )A WebRTC implemen

How urgent is CVE-2021-28681?

Priority 42/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2016-1976 MEDIUM 5.5 UPGRADE MITIGATE Use-after-free vulnerability in the DesktopDisplayDevice class in the WebRTC implementation in Mozilla Firefox
CVE-2016-1975 MEDIUM 6.3 MITIGATE UPGRADE Multiple race conditions in dom/media/systemservices/CamerasChild.cpp in the WebRTC implementation in Mozilla

References

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