CVE-2017-12920: CDirectory::GetDirEntry in dir.cxx in libfpx 1.3.1_p6 allows remote attackers to cause a denial of service (NU

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MEDIUM 6.5DOWNGRADE

CVE-2017-12920 is a medium-severity flaw (CVSS 6.5) affecting libfpx. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CDirectory::GetDirEntry in dir.cxx in libfpx 1.3.1_p6 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted fpx image.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-476
Published	2017-08-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: libfpx project

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

Am I affected?

Timeline

2017-08-28 19:29 UTCPublished CVE record published
2026-06-17 01:04 UTCUpdated Record last modified

libfpx project libfpx DOWNGRADE

Affected: 1.3.1 p6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.3.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.3.1 (Debian / Ubuntu)

apt-cache madison libfpx sudo apt install libfpx=<VERSION_BEFORE_1.3.1> sudo apt-mark hold libfpx

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

dnf --showduplicates list libfpx sudo dnf downgrade libfpx-<VERSION_BEFORE_1.3.1> sudo dnf versionlock add libfpx

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-2017-12920?

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

Is CVE-2017-12920 being exploited?

CVE-2017-12920 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-2017-12920 affect?

CVE-2017-12920 affects libfpx. Severity is medium (CVSS 6.5). CDirectory::GetDirEntry in dir.cxx in libfpx 1.3.1_p6 allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted fpx image.

How urgent is CVE-2017-12920?

Priority 40/100. No elevated risk signals yet.

Related CVEs

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CVE-2017-12925 MEDIUM 6.5 DOWNGRADE Double free vulnerability in DfFromLB in docfile.cxx in libfpx 1.3.1_p6 allows remote attackers to cause a den
CVE-2017-12924 MEDIUM 6.5 DOWNGRADE CDirVector::GetTable in dirfunc.hxx in libfpx 1.3.1_p6 allows remote attackers to cause a denial of service (d
CVE-2017-12923 MEDIUM 6.5 DOWNGRADE OLEStream::WriteVT_LPSTR in olestrm.cpp in libfpx 1.3.1_p6 allows remote attackers to cause a denial of servic
CVE-2017-12922 MEDIUM 6.5 DOWNGRADE wchar.c in libfpx 1.3.1_p6 allows remote attackers to cause a denial of service (NULL pointer dereference) via

References

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