CVE-2023-3724
highpriority · track · 35EPSS 0.007 · 51 %ileEUUSEPSS · scored 2026-10-27
If a TLS 1.3 client gets neither a PSK (pre shared key) extension nor a KSE (key share extension) when connecting to a malicious server, a default predictable buffer gets used for the IKM (Input Keying Material) value when generating the session master secret. Using a potentially known IKM value when generating the session master secret key compromises the key generated, allowing an eavesdropper to reconstruct it and potentially allowing access to or meddling with message contents in the session. This issue does not affect client validation of connected servers, nor expose private key information, but could result in an insecure TLS 1.3 session when not controlling both sides of the connection. wolfSSL recommends that TLS 1.3 client side users update the version of wolfSSL used.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (2)
Products and version ranges known to be affected.
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2023-3724/cnnvd
- https://github.com/wolfSSL/wolfssl/pull/6412cnnvd
- https://www.wolfssl.com/docs/security-vulnerabilities/cnnvd
- https://github.com/wolfSSL/wolfssl/pull/6412enisa_euvd
- https://www.wolfssl.com/docs/security-vulnerabilities/enisa_euvd
- https://github.com/wolfSSL/wolfssl/pull/6412Patchnvd
- https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisorynvd
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