CVE-2021-41991

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

5.30% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 92.2% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-10-18 13:44Z5 YR AGO

Last updated

2024-08-04 03:22Z2 YR AGO

Reserved

2021-10-04

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-190Integer Overflow or WraparoundBase

Data version

5.1

Document digest

dd38ba500d8bf8003f992a0402b7c95d0fcadc589f9b00cfc6daa90e87e0dce1

• github.comhttps://github.com/strongswan/strongswan/releases/tag/5.9.4x_refsource_MISC
• www.strongswan.orghttps://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.htmlx_refsource_CONFIRM
• www.debian.orgDSA-4989https://www.debian.org/security/2021/dsa-4989vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20211019 [SECURITY] [DLA 2788-1] strongswan security updatehttps://lists.debian.org/debian-lts-announce/2021/10/msg00014.htmlmailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2021-0b37146973https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-b3df83339ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-95fab6a482https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/vendor-advisoryx_refsource_FEDORA
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdfx_refsource_CONFIRM