CVE-2017-12144: In ytnef 1.9.2, an allocation failure was found in the function TNEFFillMapi in ytnef.c, which allows attacker

Routine

MEDIUM 5.5DOWNGRADE

CVE-2017-12144 is a medium-severity flaw (CVSS 5.5) affecting ytnef. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In ytnef 1.9.2, an allocation failure was found in the function TNEFFillMapi in ytnef.c, which allows attackers to cause a denial of service via a crafted file.

Why this priority

No elevated risk signals yet

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	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-770
Published	2017-08-02
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ytnef project

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

Am I affected?

Timeline

2017-08-02 05:29 UTCPublished CVE record published
2026-06-17 01:02 UTCUpdated Record last modified

ytnef project ytnef DOWNGRADE

Affected: 1.9.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.9.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.9.2 (Debian / Ubuntu)

apt-cache madison ytnef sudo apt install ytnef=<VERSION_BEFORE_1.9.2> sudo apt-mark hold ytnef

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

dnf --showduplicates list ytnef sudo dnf downgrade ytnef-<VERSION_BEFORE_1.9.2> sudo dnf versionlock add ytnef

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-2017-12144?

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

Is CVE-2017-12144 being exploited?

CVE-2017-12144 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-2017-12144 affect?

CVE-2017-12144 affects ytnef. Severity is medium (CVSS 5.5). In ytnef 1.9.2, an allocation failure was found in the function TNEFFillMapi in ytnef.c, which allows attackers to cause a denial of service via a crafted file.

How urgent is CVE-2017-12144?

Priority 35/100. No elevated risk signals yet.

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CVE-2021-3403 HIGH 7.8 DOWNGRADE MITIGATE In ytnef 1.9.3, the TNEFSubjectHandler function in lib/ytnef.c allows remote attackers to cause a denial-of-se
CVE-2017-9474 MEDIUM 5.5 DOWNGRADE In ytnef 1.9.2, the DecompressRTF function in lib/ytnef.c allows remote attackers to cause a denial of service
CVE-2017-9473 MEDIUM 5.5 DOWNGRADE MITIGATE In ytnef 1.9.2, the TNEFFillMapi function in lib/ytnef.c allows remote attackers to cause a denial of service
CVE-2017-9472 MEDIUM 5.5 DOWNGRADE In ytnef 1.9.2, the SwapDWord function in lib/ytnef.c allows remote attackers to cause a denial of service (he

References

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