Is CVE-2021-3181 in the CISA KEV catalog?

No. CVE-2021-3181 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3181?

CVE-2021-3181 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-3181?

CVE-2021-3181 has an EPSS score of 2.80% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3181?

Upgrade mutt on debian 11 to 2.0.5-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-3181

MEDIUMEPSS 85th pctl

6.5

CVSS v3

NVD

Description

rfc822.c in Mutt through 2.0.4 allows remote attackers to cause a denial of service (mailbox unavailability) by sending email messages with sequences of semicolon characters in RFC822 address fields (aka terminators of empty groups). A small email message from the attacker can cause large memory consumption, and the victim may then be unable to see email messages from other persons.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

muttDebian

Fixed in:2.0.5-1CVE-2021-3181

muttUbuntu

Fixed in:1.5.24-1ubuntu0.6USN-4703-1

Fixed in:1.9.4-3ubuntu0.5USN-4703-1

Fixed in:1.13.2-1ubuntu0.4USN-4703-1

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

2.80%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Patch3

Third-Party Advisory6

Other references2

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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.