CVE-2010-5109: Off-by-one error in the DecompressRTF function in ytnef.c in Yerase's TNEF Stream Reader allows remote attacke

Routine

MEDIUM 4.3MITIGATEMITIGATE

CVE-2010-5109 is a medium-severity flaw (CVSS 4.3) affecting yerase\'s tnef stream reader, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Off-by-one error in the DecompressRTF function in ytnef.c in Yerase's TNEF Stream Reader allows remote attackers to cause a denial of service (crash) via a crafted TNEF file, which triggers a buffer overflow.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-189
Published	2014-05-05
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: fedoraproject · randall hand

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-05-05 17:06 UTCPublished CVE record published
2026-06-16 23:26 UTCUpdated Record last modified

randall hand yerase\'s tnef stream reader 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 yerases-tnef-stream-reader || rpm -q yerases-tnef-stream-reader || yerases-tnef-stream-reader --version

No fixed or unaffected release known

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

fedoraproject fedora MITIGATE

Affected: 16 · 17

Fixed in: no fixed release known

Safe to downgrade to: a release before 16

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2010-5109?

yerase\'s tnef stream reader: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2010-5109 being exploited?

CVE-2010-5109 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-2010-5109 affect?

CVE-2010-5109 affects yerase\'s tnef stream reader, fedora. Severity is medium (CVSS 4.3). Off-by-one error in the DecompressRTF function in ytnef.c in Yerase's TNEF Stream Reader allows remote attackers to cause a denial of service (crash) via a crafted TNEF file, which triggers a buffer overflow.

How urgent is CVE-2010-5109?

Priority 36/100. No elevated risk signals yet.

References

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