Cyber Resilience

CVE-2021-33582

HighDDoS

Published: 01 September 2021

Published
01 September 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0102 77.6th percentile
Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-33582 is a high-severity Inefficient Algorithmic Complexity (CWE-407) vulnerability in Cyrus Imap. Its CVSS base score is 7.5 (High).

Operationally, ranked in the top 22.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

more

3.4.2, 3.2.8, and 3.0.16.

CWE(s)
CWE-407

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

cyrus
imap
≤ 3.0.16 · 3.2.0 — 3.2.8 · 3.4.0 — 3.4.2
fedoraproject
fedora
34, 35
debian
debian linux
9.0

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-5 Denial-of-service Protection
addresses: CWE-407

Addresses inefficient algorithms whose complexity can be exploited for DoS.

References