HOMEVULNERABILITIESCVE-2020-21679
MEDIUM

CVE-2020-21679

CWE-787Published: August 22, 2023· Updated: Jun 17, 2026

5.5
CVSS v3.1

Official Description

Buffer Overflow vulnerability in WritePCXImage function in pcx.c in GraphicsMagick 1.4 allows remote attackers to cause a denial of service via converting of crafted image file to pcx format.

NVD Source

Technical Analysis

CVE-2020-21679 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.5.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

graphicsmagick1 product(s)
graphicsmagick
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://sourceforge.net/p/graphicsmagick/bugs/619/
ADVISORYhttps://sourceforge.net/p/graphicsmagick/bugs/619/

All References (2)

→
https://sourceforge.net/p/graphicsmagick/bugs/619/Exploit · Third Party Advisory
→
https://sourceforge.net/p/graphicsmagick/bugs/619/Exploit · Third Party Advisory

Quick Facts

CVE IDCVE-2020-21679
CVSS Score5.5 / 10
SeverityMEDIUM
WeaknessCWE-787
CISA KEVNo
Affected1 vendor(s)
PublishedAug 22, 2023

Related CVEs (CWE-787)

CVE-2014-1478
10.0
CVE-2013-5610
10.0
CVE-2012-0751
10.0
CVE-2011-1807
10.0
CVE-2012-3957
10.0
CVE-2015-5105
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-21679 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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