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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.007 (52.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.telekom.com/en/company/data-privacy-and-security/news/advisories-504842 (Exploit, Third Party Advisory)
- www.rambus.com/security/software-protocols/tls-toolkit/ (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.