🛡️ CVE-2023-6937
🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-20 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

wolfSSL prior to 5.6.6 did not check that messages in one (D)TLS record do not span key boundaries. As a result, it was possible to combine (D)TLS messages using different keys into one (D)TLS record. The most extreme edge case is that, in (D)TLS 1.3, it was possible that an unencrypted (D)TLS 1.3 record from the server containing first a ServerHello message and then the rest of the first server flight would be accepted by a wolfSSL client. In (D)TLS 1.3 the handshake is encrypted after the ServerHello but a wolfSSL client would accept an unencrypted flight from the server. This does not compromise key negotiation and authentication so it is assigned a low severity rating.

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE CWE-20
Public Exploit ✅ No
Source NVD
Published 2024-02-15
Updated 2026-06-08
Modified 2025-02-21

Affected Packages

Software From version Fixed in
wolfssl — 5.6.6

Similar Threats

Exploit Protection

Help block exploit attempts

BotEraser is designed to detect and help reduce malicious bot traffic that may target known vulnerabilities on your site.

Try BotEraser Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.