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CVE-2017-8929

25
FAUCET Score

CVE-2017-8929 is a use-after-free vulnerability in the sized_string_cmp function of YARA 3.5.0, affecting products like VirusTotal YARA. This high-severity vulnerability (CVSS 7.5) allows remote attackers to cause a denial of service through a crafted rule, requiring no user interaction or privileges. Despite its potential for application crashes, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
3.5.0CPE matchmatch criteria
cpe:2.3:a:virustotal:yara:3.5.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 60th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

github_advisorypatch availablevia nvd_reference
View patch
ubuntupatch availablevia ubuntu_usn
Product: yara (bionic)Fixed in: 3.7.1-1ubuntu2+esm1
ubuntupatch availablevia ubuntu_usn
Product: yara (focal)Fixed in: 3.9.0-1ubuntu0.1~esm1
ubuntupatch availablevia ubuntu_usn
Product: yara (xenial)Fixed in: 3.4.0+dfsg-2ubuntu0.1~esm1

Vendor Advisories (1)

ubuntuUSN-8080-1

YARA vulnerabilities

Mar 9, 2026

References

github.com / VirusTotal/yara/commit/053e67e3ec81cc9268ce30eaf0d6663d8639ed1e
Patch
github.com / VirusTotal/yara/issues/658
Issue TrackingPatch