CVE-2016-1976: Use-after-free vulnerability in the DesktopDisplayDevice class in the WebRTC implementation in Mozilla Firefox

Q: How do I fix CVE-2016-1976?

firefox: upgrade to newer than 44.0.2; webrtc: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2016-1976 being exploited?

CVE-2016-1976 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-2016-1976 affect?

CVE-2016-1976 affects firefox, webrtc. Severity is medium (CVSS 5.5). Use-after-free vulnerability in the DesktopDisplayDevice class in the WebRTC implementation in Mozilla Firefox before 45.0 on Windows might allow remote attackers to cause a denial of service or possibly have unspecified other impact via un

Q: How urgent is CVE-2016-1976?

Priority 37/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADEMITIGATE

CVE-2016-1976 is a medium-severity flaw (CVSS 5.5) affecting firefox, webrtc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Use-after-free vulnerability in the DesktopDisplayDevice class in the WebRTC implementation in Mozilla Firefox before 45.0 on Windows might allow remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Published	2016-03-13
Last modified	2026-06-17

Publisher (CNA): Mozilla Corporation · Vendor: mozilla · webrtc project

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

Am I affected?

Timeline

2016-03-13 18:59 UTCPublished CVE record published
2026-06-17 00:43 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: <= 44.0.2

Fixed in: newer than 44.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 44.0.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

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

webrtc project webrtc MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

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

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2016-1976?

firefox: upgrade to newer than 44.0.2; webrtc: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-1976 being exploited?

CVE-2016-1976 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-2016-1976 affect?

CVE-2016-1976 affects firefox, webrtc. Severity is medium (CVSS 5.5). Use-after-free vulnerability in the DesktopDisplayDevice class in the WebRTC implementation in Mozilla Firefox before 45.0 on Windows might allow remote attackers to cause a denial of service or possibly have unspecified other impact via un

How urgent is CVE-2016-1976?

Priority 37/100. No elevated risk signals yet.

Software pages

Windows vulnerabilities · Mozilla Firefox vulnerabilities

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References

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