CVE & CISA-KEV Catalog

CVE-2021-33582

HIGHEPSS 86th pctl
7.5
CVSS v3
NVD

Description

Cyrus IMAP before 3.4.2 allows remote attackers to cause a denial of service (multiple-minute daemon hang) via input that is mishandled during hash-table interaction. Because there are many insertions into a single bucket, strcmp becomes slow. This is fixed in 3.4.2, 3.2.8, and 3.0.16.

CWE-407

How to fix

Remediation Available
cyrus-imapdDebian
Fixed in:3.2.6-2+deb11u1CVE-2021-33582
Fixed in:3.4.2-1CVE-2021-33582
Fixed in:3.4.2-1CVE-2021-33582
Fixed in:3.4.2-1CVE-2021-33582
cyrus-adminUbuntu
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-caldavUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-clientsUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-commonUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-devUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-imapdUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-murderUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-nntpdUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-pop3dUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
cyrus-replicationUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1
libcyrus-imap-perlUbuntu
Fixed in:2.5.10-3ubuntu1.1+esm1USN-7224-1
Fixed in:3.0.13-5ubuntu0.1~esm1USN-7224-1
Fixed in:3.4.3-3ubuntu0.1+esm1USN-7224-1
Fixed in:3.8.2-1ubuntu0.1~esm1USN-7224-1

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

3.07%probability of exploitation in 30 days
86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Third-Party Advisory2
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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.