CVE-2023-40857

FAUCET Score

CVE-2023-40857 is a high-severity buffer overflow vulnerability affecting VirusTotal YARA version 4.3.2, specifically within the yr_execute_code function in the exe.c component. This flaw allows a remote attacker to execute arbitrary code with high impact on confidentiality, integrity, and availability, requiring user interaction for exploitation. While rated with a CVSS score of 8.8, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		4.3.2CPE matchmatch criteria	cpe:2.3:a:virustotal:yara:4.3.2:::::::*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

Exploitability Score

2.8

Impact Score

5.9

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.87%

Probability of exploitation in next 30 days

EPSS Percentile

55.1%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0087 is in the 57th percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference

View patch

Vendor Advisories (1)

redhatCVE-2023-40857Important

yara: buffer overflow that allows a remote attacker to execute arbtirary code via the yr_execute_cod function

Aug 29, 2023

References

github.com / VirusTotal/yara/issues/1945

ExploitIssue TrackingVendor Advisory