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.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1922136	Issue Tracking Patch Third Party Advisory
https://www.debian.org/security/2021/dsa-4889	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html	Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html	Mailing List Third Party Advisory
https://www.oracle.com/security-alerts/cpuoct2021.html	Not Applicable Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:a:pygments:pygments:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:a:redhat:openshift_container_platform:3.11:::::::*
	cpe:2.3:a:redhat:openshift_container_platform:4.0:::::::*
	cpe:2.3:a:redhat:openstack_platform:10.0:::::::*
	cpe:2.3:a:redhat:software_collections:-:::::::*
	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*

Configuration 3 (hide)

cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*

Configuration 4 (hide)

OR	cpe:2.3:o:debian:debian_linux:9.0:::::::*
	cpe:2.3:o:debian:debian_linux:10.0:::::::*

Information

Published : 2021-03-23 10:15

Updated : 2021-12-10 09:04

NVD link : CVE-2021-20270

Mitre link : CVE-2021-20270

JSON object : View

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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Products Affected

redhat

enterprise_linux
openstack_platform
openshift_container_platform
software_collections

pygments

pygments

fedoraproject

fedora

debian

debian_linux

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