Integer overflow in Siemens Cp 1543-1
CVE-2021-41991
The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.
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: 0.053 (92.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 92.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.052 · newest: 0.053 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/strongswan/strongswan/releases/tag/5.9.4 (Third Party Advisory)
- www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).ht…
- www.debian.org/security/2021/dsa-4989 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/10/msg00014.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-41991?
- CVE-2021-41991 is a high-severity vulnerability in Siemens Cp 1543-1, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2021-10-18.
- How severe is CVE-2021-41991?
- High severity. CVSS v3 base score is 7.5 out of 10.