CVE & CISA-KEV Catalog

CVE-2021-40516

HIGHEPSS 73th pctl
7.5
CVSS v3
NVD

Description

WeeChat before 3.2.1 allows remote attackers to cause a denial of service (crash) via a crafted WebSocket frame that trigger an out-of-bounds read in plugins/relay/relay-websocket.c in the Relay plugin.

CWE-125Out-of-bounds Read

How to fix

Remediation Available
weechatDebian
Fixed in:3.0-1+deb11u1CVE-2021-40516
Fixed in:3.2.1-1CVE-2021-40516
Fixed in:3.2.1-1CVE-2021-40516
Fixed in:3.2.1-1CVE-2021-40516
weechatUbuntu
Fixed in:1.4-2ubuntu0.1+esm1USN-5258-1
Fixed in:1.9.1-1ubuntu1+esm1USN-5258-1
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-coreUbuntu
Fixed in:1.4-2ubuntu0.1+esm1USN-5258-1
Fixed in:1.9.1-1ubuntu1+esm1USN-5258-1
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-cursesUbuntu
Fixed in:1.4-2ubuntu0.1+esm1USN-5258-1
Fixed in:1.9.1-1ubuntu1+esm1USN-5258-1
weechat-guileUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-headlessUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-luaUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-perlUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-phpUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-pluginsUbuntu
Fixed in:1.4-2ubuntu0.1+esm1USN-5258-1
Fixed in:1.9.1-1ubuntu1+esm1USN-5258-1
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-pythonUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-rubyUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1
weechat-tclUbuntu
Fixed in:2.8-1ubuntu0.1~esm1USN-5258-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

1.59%probability of exploitation in 30 days
73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Third-Party Advisory1

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2014-0160High7.5100%KEVFix
CVE-2025-5777High7.5100%KEV + RansomFix
CVE-2021-4034High7.895%KEVFix
CVE-2023-21769High7.592%-Fix
CVE-2023-49285High8.689%-Fix
CVE-2020-8794Critical9.889%-Fix
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CVE-2021-40516 severity badge

Markdown

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.