CVE-2021-41991
Estado: ModificadaAlta (7.5)—
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.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 7.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 5.30%
- Percentil entre todas las CVEs puntuadas: 92
- Fecha de la puntuación: 1/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (25)
Debian — Debian LinuxFedoraproject — FedoraSiemens — CP 1543-1 FirmwareSiemens — Scalance Sc622-2c FirmwareSiemens — Scalance Sc632-2c FirmwareSiemens — Scalance Sc636-2c FirmwareSiemens — Scalance Sc642-2c FirmwareSiemens — Scalance Sc646-2c FirmwareSiemens — Simatic CP 1242-7 Gprs V2 FirmwareSiemens — Simatic CP 1243-1 FirmwareSiemens — Simatic CP 1243-7 Lte/us FirmwareSiemens — Simatic CP 1542sp-1 FirmwareSiemens — Simatic CP 1542sp-1 IRC FirmwareSiemens — Simatic CP 1543sp-1 FirmwareSiemens — Simatic NET Cp1243-7 LTE EU FirmwareSiemens — Simatic NET CP 1243-8 IRC FirmwareSiemens — Simatic NET CP 1545-1 FirmwareSiemens — Sinema Remote Connect ServerSiemens — Siplus ET 200sp CP 1542sp-1 IRC TX Rail FirmwareSiemens — Siplus ET 200sp CP 1543sp-1 Isec FirmwareSiemens — Siplus ET 200sp CP 1543sp-1 Isec TX Rail FirmwareSiemens — Siplus NET CP 1543-1 FirmwareSiemens — Siplus S7-1200 CP 1243-1 FirmwareSiemens — Siplus S7-1200 CP 1243-1 Rail FirmwareStrongswan — Strongswan
CWE
- CWE-190
Referencias
- https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf
- https://github.com/strongswan/strongswan/releases/tag/5.9.4
- https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
- https://www.debian.org/security/2021/dsa-4989
- https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf
- https://github.com/strongswan/strongswan/releases/tag/5.9.4
- https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/
- https://www.debian.org/security/2021/dsa-4989
- https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html
JSON original (NVD)
Mostrar
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