CVE-2020-21723: A Segmentation Fault issue discovered StreamSerializer::extractStreams function in streamSerializer.cpp in ogg

Routine

MEDIUM 5.5DOWNGRADE

CVE-2020-21723 is a medium-severity flaw (CVSS 5.5) affecting ogg video tools. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Segmentation Fault issue discovered StreamSerializer::extractStreams function in streamSerializer.cpp in oggvideotools 0.9.1 allows remote attackers to cause a denial of service (crash) via opening of crafted ogg file.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-787
Published	2023-08-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ogg video tools project

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

Am I affected?

Timeline

2023-08-22 19:16 UTCPublished CVE record published
2026-06-17 03:03 UTCUpdated Record last modified

ogg video tools project ogg video tools DOWNGRADE

Affected: 0.9.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9.1

1. Check installed version

apt-cache policy ogg-video-tools || rpm -q ogg-video-tools || ogg-video-tools --version

2. No fixed release: DOWNGRADE to a release before 0.9.1 (Debian / Ubuntu)

apt-cache madison ogg-video-tools sudo apt install ogg-video-tools=<VERSION_BEFORE_0.9.1> sudo apt-mark hold ogg-video-tools

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

dnf --showduplicates list ogg-video-tools sudo dnf downgrade ogg-video-tools-<VERSION_BEFORE_0.9.1> sudo dnf versionlock add ogg-video-tools

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-2020-21723?

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

Is CVE-2020-21723 being exploited?

CVE-2020-21723 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-2020-21723 affect?

CVE-2020-21723 affects ogg video tools. Severity is medium (CVSS 5.5). A Segmentation Fault issue discovered StreamSerializer::extractStreams function in streamSerializer.cpp in oggvideotools 0.9.1 allows remote attackers to cause a denial of service (crash) via opening of crafted ogg file.

How urgent is CVE-2020-21723?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2020-21724 HIGH 7.8 DOWNGRADE Buffer Overflow vulnerability in ExtractorInformation function in streamExtractor.cpp in oggvideotools 0.9.1 a
CVE-2020-21722 HIGH 7.8 DOWNGRADE Buffer Overflow vulnerability in oggvideotools 0.9.1 allows remote attackers to run arbitrary code via opening

References

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