CVE-2023-40857

Exp

Buffer Overflow vulnerability in VirusTotal yara v.4.3.2 allows a remote attacker to execute arbtirary code via the yr_execute_cod function in the exe.c component.

Published: 2023-08-28 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-40857 is rated High Exploit Risk (67.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.87%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2023-40857

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2023-40857

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 2.51% 0.87% -1.64%
2 2026-01-30 1.30% 2.51% +1.21%
3 2025-11-21 — 1.30% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-40857

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2023-40857

OS Trackers for CVE-2023-40857

vendor priority summary link
redhat high — https://access.redhat.com/security/cve/CVE-2023-40857
suse medium — https://www.suse.com/security/cve/CVE-2023-40857/
ubuntu medium CVE-2023-40857 medium priority: Ubuntu including 1 source packages (yara), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 11, DNE 1. https://ubuntu.com/security/CVE-2023-40857

Affected software / configurations for CVE-2023-40857

Vendor Product Version Raw CPE
virustotal yara 4.3.2 cpe:2.3:a:virustotal:yara:4.3.2:*:*:*:*:*:*:*

References for CVE-2023-40857

URL Tags
https://github.com/VirusTotal/yara/issues/1945 Exploit Issue Tracking Vendor Advisory
cvelogic Threat Intelligence