CVE-2021-39520

CVSS V2 Medium 4.3 CVSS V3 Medium 6.5

Description

An issue was discovered in libjpeg through 2020021. A NULL pointer dereference exists in the function BlockBitmapRequester::PushReconstructedData() located in blockbitmaprequester.cpp. It allows an attacker to cause Denial of Service.

Overview

CVE ID
CVE-2021-39520

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2021-09-20T16:15:11

Last Modified Date
2021-09-24T20:58:47

Weakness Enumerations

CWE	URL
CWE-476	http://cwe.mitre.org/data/definitions/476.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
cpe:2.3:a:jpeg:libjpeg::::::::	1	OR		2020021

CVSS Version 2

Version
2.0

Vector String
AV:N/AC:M/Au:N/C:N/I:N/A:P

Access Vector
NETWORK

Access Compatibility
MEDIUM

Authentication
NONE

Confidentiality Impact
NONE

Integrity Impact
NONE

Availability Impact
PARTIAL

Base Score
4.3

Severity
MEDIUM

Exploitability Score
8.6

Impact Score
2.9

CVSS Version 3

Version
3.1

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

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
REQUIRED

Scope
UNCHANGED

Confidentiality Impact
NONE

Availability Impact
HIGH

Base Score
6.5

Base Severity
MEDIUM

Exploitability Score
2.8

Impact Score
3.6

References

Reference URL	Reference Tags
https://github.com/thorfdbg/libjpeg/issues/34	Exploit Issue Tracking Patch Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-39520
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-39520

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 06:53:27				Added to TrackCVE
2022-12-05 10:57:42	2021-09-20T16:15Z	2021-09-20T16:15:11	CVE Published Date	updated
2022-12-05 10:57:42		2021-09-24T20:58:47	CVE Modified Date	updated
2022-12-05 10:57:42		Analyzed	Vulnerability Status	updated