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Vulnerability Details : CVE-2021-20270

An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.
Publish Date : 2021-03-23 Last Update Date : 2021-12-10
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact None (There is no impact to the confidentiality of the system.)
Integrity Impact None (There is no impact to the integrity of the system)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 835

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:4139: resource-agents security, bug fix, and enhancement update (Moderate) oval:com.redhat.rhsa:def:20214139 unix
RHSA-2021:4150: python36:3.6 security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20214150 unix
RHSA-2021:4151: python27:2.7 security update (Moderate) oval:com.redhat.rhsa:def:20214151 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-20270

# Product Type Vendor Product Version Update Edition Language
1 OS Debian Debian Linux 9.0 * * * Version Details Vulnerabilities
2 OS Debian Debian Linux 10.0 * * * Version Details Vulnerabilities
3 OS Fedoraproject Fedora 33 * * * Version Details Vulnerabilities
4 Application Pygments Pygments * * * * Version Details Vulnerabilities
5 OS Redhat Enterprise Linux 7.0 * * * Version Details Vulnerabilities
6 OS Redhat Enterprise Linux 8.0 * * * Version Details Vulnerabilities
7 Application Redhat Openshift Container Platform 3.11 * * * Version Details Vulnerabilities
8 Application Redhat Openshift Container Platform 4.0 * * * Version Details Vulnerabilities
9 Application Redhat Openstack Platform 10.0 * * * Version Details Vulnerabilities
10 Application Redhat Software Collections - * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Debian Debian Linux 2
Fedoraproject Fedora 1
Pygments Pygments 1
Redhat Enterprise Linux 2
Redhat Openshift Container Platform 2
Redhat Openstack Platform 1
Redhat Software Collections 1

- References For CVE-2021-20270
MLIST [debian-lts-announce] 20210505 [SECURITY] [DLA 2648-1] mediawiki security update
MLIST [debian-lts-announce] 20210506 [SECURITY] [DLA 2648-2] mediawiki regression update

- Metasploit Modules Related To CVE-2021-20270

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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