Mend.io Vulnerability Database

What is a CVE vulnerability ID? icon What is a WS vulnerability ID? icon What is an MSC vulnerability ID? icon
New vulnerability? Tell us about it!
icon

We found results for “”

CVE-2021-20270

Good to know:

icon
icon

Date: March 23, 2021

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.

Language: Python

Severity Score

Related Resources (13)

https://nvd.nist.gov/vuln/detail/CVE-2021-20270
https://github.com/pygments/pygments
https://access.redhat.com/security/cve/CVE-2021-20270
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
https://github.com/pygments/pygments/commit/f91804ff4772e3ab41f46e28d370f57898700333
https://bugzilla.redhat.com/show_bug.cgi?id=1922136
https://security.alpinelinux.org/vuln/CVE-2021-20270
https://www.debian.org/security/2021/dsa-4889
https://www.oracle.com/security-alerts/cpuoct2021.html
https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-140.yaml
https://security-tracker.debian.org/tracker/CVE-2021-20270
https://www.mend.io/vulnerability-database/CVE-2021-20270

Severity Score

Weakness Type (CWE)

Loop with Unreachable Exit Condition ('Infinite Loop')

CWE-835

Top Fix

icon

Upgrade Version

Upgrade to version pygments - 2.7.4

Learn More

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

Do you need more information?

Contact Us