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The vulnerability of the XLookupColor() function in the libX11 library, which stems from insufficient input data validation, allows a malicious actor to perform denial-of-service attacks.

🗓️ 01 Jun 2021 00:00:00Reported by FSTEC of Russia — Information Security Threat DatabaseType 
bdu_fstec
 bdu_fstec🔗 bdu.fstec.ru👁 3 Views

XLookupColor vulnerability in the X window library allows denial of service due to insufficient input validation.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: LookupCol.c in X.Org X through X11R7.7 and libX11 before 1.7.1 might allow remote attackers to execute arbitrary code, affect watsonx.data
16 Jun 202505:33
–ibm
IBM Security Bulletins		Security Bulletin: IBM Watson Speech Services Cartridge is vulnerable to multiple Base OS issues
19 Jun 202517:28
–ibm
IBM Security Bulletins		Security Bulletin: IBM QRadar Network Security is affected by multiple vulnerabilities (CVE-2020-25648, CVE-2021-31535, CVE-2021-20305, CVE-2020-25692)
8 Nov 202103:57
–ibm
IBM Security Bulletins		Security Bulletin: IBM Security QRadar Event and Flow Exporter App is vulnerable to using components with known vulnerabilities (CVE-2021-31535, CVE-2020-17541)
16 Jun 202218:26
–ibm
FreeBSD		libX11 -- Arbitrary code execution
11 May 202100:00
–freebsd
Tenable Nessus		Amazon Linux 2 : libX11 (ALAS-2021-1686)
16 Jul 202100:00
–nessus
Tenable Nessus		Amazon Linux AMI : libX11 (ALAS-2021-1517)
13 Jul 202100:00
–nessus
Tenable Nessus		AlmaLinux 8 : libX11 (ALSA-2021:4326)
9 Feb 202200:00
–nessus
Tenable Nessus		CentOS 8 : libX11 (CESA-2021:4326)
11 Nov 202100:00
–nessus
Tenable Nessus		CentOS 7 : libX11 (RHSA-2021:3296)
30 Aug 202100:00
–nessus
Rows per page
Vulners
Node
x.orgxlib_(libx11)Range1.0.99.1–1.7.0
OR
red_hatred_hat_enterprise_linuxMatch7
OR
red_hatred_hat_enterprise_linuxMatch8
OR
canonicalubuntuMatch20.10
OR
canonicalubuntuMatch21.04

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19 Aug 2025 00:00Current
7High risk
Vulners AI Score7
CVSS 22.1
CVSS 33.3
EPSS0.10634
XLookupColor vulnerabilityX window libraryInput validation faultDenial of service
3