Integer overflow in Matrixssl
CVE-2023-24609
Matrix SSL 4.x through 4.6.0 and Rambus TLS Toolkit have a length-subtraction integer overflow for Client Hello Pre-Shared Key extension parsing in the TLS 1.3 server. An attacked device calculates an SHA-2 hash over at least 65 KB (in RAM). With a large number of crafted TLS messages, the CPU becomes heavily loaded. This occurs in tls13VerifyBinder and tls13TranscriptHashUpdate.
Vulnerability class: Integer Overflow
EPSS: 0.007 (50.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Matrixssl
- Rambus Tls_toolkit
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Exploit, Third Party Advisory)
- cve@mitre.org (Product)
Frequently asked questions
- What is CVE-2023-24609?
- CVE-2023-24609 is a high-severity vulnerability in Matrixssl, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2023-12-22.
- How severe is CVE-2023-24609?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-24609 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.