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Fencer Intel
high 7.5

CVE-2021-41990 json

The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an RSASSA-PSS signature.

published 5y ago modified 4mo ago also EUVD-2021-28980

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.9%
EPSS 6.9% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

The gmp plugin in strongSwan before 5.9.4 has a remote integer overflow via a crafted certificate with an RSASSA-PSS signature. For example, this can be triggered by an unrelated self-signed CA certificate sent by an initiator. Remote code execution cannot occur.

Patch / fix

  • strongswan strongswan 5.9.4
  • strongswan Debian 14, Debian 13, Debian 12 5.9.4-1

debian advisories DEBIAN-CVE-2021-41990

  • strongswan Ubuntu 18.04 LTS 5.6.2-1ubuntu2.7
  • strongswan Ubuntu 20.04 LTS 5.8.2-1ubuntu3.3
  • strongswan Ubuntu 22.04 LTS 5.9.1-1ubuntu3.1
  • strongswan Ubuntu Pro FIPS-updates 18.04 LTS 5.6.2-1ubuntu2.fips.2.7.1
  • strongswan Ubuntu Pro FIPS-updates 20.04 LTS 5.8.2-1ubuntu3.fips.3.3.1

ubuntu advisories UBUNTU-CVE-2021-41990

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • strongswan SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +7 more 5.8.2-4.14.2
  • strongswan SLE Workstation Extension 15 SP3, SLE Workstation Extension 15 SP2, SLE Module for Package Hub 15 SP3 +3 more 5.8.2-11.21.1

suse advisories SUSE-SU-2021:3469-1SUSE-SU-2021:3467-1

  • strongswan openSUSE Tumbleweed 5.9.4-1.1
  • strongswan openSUSE Leap 15.2 5.8.2-lp152.2.18.1
  • strongswan openSUSE Leap 15.3 5.8.2-11.21.1

opensuse advisories openSUSE-SU-2024:11655-1openSUSE-SU-2021:1399-1openSUSE-SU-2021:3467-1

  • strongswan Alpine 3.12 5.8.4-r3
  • strongswan Alpine 3.13 5.9.1-r1
  • strongswan Alpine 3.14 5.9.1-r2
  • strongswan Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 5.9.1-r3

alpine advisories ALPINE-CVE-2021-41990

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • strongswan CBL-Mariner 2.0 5.9.5-1

azure linux advisories AZL-6896

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • strongswan Arch Linux 5.9.4-1

arch linux advisories AVG-2473

Is CVE-2021-41990 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41990 updated cvss 7.5

strongswan: gmp plugin: integer overflow via a crafted certificate with an RSASSA-PSS signature

  • Red Hat Enterprise Linux 7 strongimcv
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-25-259-03 updated cvss 7.5

Siemens SIMATIC NET CP, SINEMA and SCALANCE

  • Siemens RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2) <V7.1 Siemens RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2) <V7.1 Siemens SCALANCE M804PB (6GK5804-0AP00-2AA2) <V7.1 Siemens SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2) <V7.1 Siemens SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2) <V7.1 Siemens SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2) <V7.1
    +12 more products
    Siemens SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2) <V7.1 Siemens SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2) <V7.1 Siemens SCALANCE M874-2 (6GK5874-2AA00-2AA2) <V7.1 Siemens SCALANCE M874-3 (6GK5874-3AA00-2AA2) <V7.1 Siemens SCALANCE M876-3 (EVDO) (6GK5876-3AA02-2BA2) <V7.1 Siemens SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2) <V7.1 Siemens SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2) <V7.1 Siemens SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2) <V7.1 Siemens SCALANCE MUM853-1 (EU) (6GK5853-2EA00-2DA1) <V7.1 Siemens SCALANCE MUM856-1 (EU) (6GK5856-2EA00-3DA1) <V7.1 Siemens SCALANCE MUM856-1 (RoW) (6GK5856-2EA00-3AA1) <V7.1 Siemens SCALANCE S615 (6GK5615-0AA00-2AA2) <V7.1
    affected: mitigation “Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:” support.industry.siemens.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

6.92% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.