CVE-2021-27291

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

3.91% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 89.4% 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

2021-03-17 12:31Z5 YR AGO

Last updated

2024-08-03 20:48Z2 YR AGO

Reserved

2021-02-16

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-1333Inefficient Regular Expression ComplexityBase
• CWE-400Uncontrolled Resource ConsumptionClass

Data version

5.1

Document digest

f39eb9bca20d5d422965ffa55726b4b00c6994e485d70ebef06f46807be2b625

• gist.github.comhttps://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5cex_refsource_MISC
• github.comhttps://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14x_refsource_MISC
• lists.debian.org[debian-lts-announce] 20210319 [SECURITY] [DLA 2600-1] pygments security updatehttps://lists.debian.org/debian-lts-announce/2021/03/msg00024.htmlmailing-listx_refsource_MLIST
• www.debian.orgDSA-4878https://www.debian.org/security/2021/dsa-4878vendor-advisoryx_refsource_DEBIAN
• www.debian.orgDSA-4889https://www.debian.org/security/2021/dsa-4889vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20210505 [SECURITY] [DLA 2648-1] mediawiki security updatehttps://lists.debian.org/debian-lts-announce/2021/05/msg00003.htmlmailing-listx_refsource_MLIST
• lists.fedoraproject.orgFEDORA-2021-166dfc62b2https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-3f975f68c8https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/vendor-advisoryx_refsource_FEDORA
• lists.debian.org[debian-lts-announce] 20210506 [SECURITY] [DLA 2648-2] mediawiki regression updatehttps://lists.debian.org/debian-lts-announce/2021/05/msg00006.htmlmailing-listx_refsource_MLIST