Is CVE-2023-39969 actively exploited?

No active exploitation of CVE-2023-39969 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-39969 be exploited remotely?

Yes. CVE-2023-39969 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-39969?

CVE-2023-39969 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-39969

CWE-347Published: August 9, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Version 1.0.9 of uthenticode hashed the entire file rather than hashing sections by virtual address, in violation of the Authenticode specification. As a result, an attacker could modify code within a binary without changing its Authenticode hash, making it appear valid from uthenticode's perspective. Versions of uthenticode prior to 1.0.9 are not vulnerable to this attack, nor are versions in the 2.x series. By design, uthenticode does not perform full-chain validation. However, the malleability of signature verification introduced in 1.0.9 was an unintended oversight. The 2.x series addresses the vulnerability. Versions prior to 1.0.9 are also not vulnerable, but users are encouraged to upgrade rather than downgrade. There are no workarounds to this vulnerability.

NVD Source

Technical Analysis

CVE-2023-39969 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.