CVE-2017-6299: An issue was discovered in ytnef before 1.9.1

Q: How do I fix CVE-2017-6299?

ytnef: upgrade to newer than 1.9; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2017-6299 being exploited?

CVE-2017-6299 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-2017-6299 affect?

CVE-2017-6299 affects ytnef, debian linux. Severity is medium (CVSS 5.5). An issue was discovered in ytnef before 1.9.1. This is related to a patch described as "2 of 9. Infinite Loop / DoS in the TNEFFillMapi function in lib/ytnef.c."

Q: How urgent is CVE-2017-6299?

Priority 41/100. On your watchlist

This month

MEDIUM 5.5WATCHLISTUPGRADEMITIGATE

CVE-2017-6299 is a medium-severity flaw (CVSS 5.5) affecting ytnef, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in ytnef before 1.9.1. This is related to a patch described as "2 of 9. Infinite Loop / DoS in the TNEFFillMapi function in lib/ytnef.c."

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-835
Published	2017-02-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · ytnef project

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

Am I affected?

Timeline

2017-02-24 04:59 UTCPublished CVE record published
2026-06-17 01:22 UTCUpdated Record last modified

ytnef project ytnef UPGRADE

Affected: <= 1.9

Fixed in: newer than 1.9

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ytnef

Note

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

debian debian linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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-2017-6299?

ytnef: upgrade to newer than 1.9; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-6299 being exploited?

CVE-2017-6299 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-2017-6299 affect?

CVE-2017-6299 affects ytnef, debian linux. Severity is medium (CVSS 5.5). An issue was discovered in ytnef before 1.9.1. This is related to a patch described as "2 of 9. Infinite Loop / DoS in the TNEFFillMapi function in lib/ytnef.c."

How urgent is CVE-2017-6299?

Priority 41/100. On your watchlist

Software pages

Debian vulnerabilities

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References

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