7.5

CVE-2021-33582: cyrus imap Inefficient Algorithmic Complexity

CVSS: 7.5v3.1HighModified
AliasesMGASA-2022-0247RHSA-2021:3492RHSA-2021:3493
Published 01-09-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-33582 is a high (CVSS 7.5) Inefficient Algorithmic Complexity vulnerability in cyrus imap. EPSS estimates a 3.09% chance of exploitation in the next 30 days, higher than 87.5% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
3.09%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
DLA-3052-1USN-7224-1

Timeline

  1. 01-09-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

3.09%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

0.00 pp

From 3.09% on 20-09-2026

20-09-202620-10-2026
EPSS score
3.09%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat7 products
  • cyrus-imapd< 0:3.0.7-20.el8_4.1 | < 0:3.0.7-16.el8_2.1 | < 0:3.0.7-16.el8_1.1
  • cyrus-imapd-debuginfo< 0:3.0.7-20.el8_4.1 | < 0:3.0.7-16.el8_2.1 | < 0:3.0.7-16.el8_1.1
  • cyrus-imapd-debugsource< 0:3.0.7-20.el8_4.1 | < 0:3.0.7-16.el8_2.1 | < 0:3.0.7-16.el8_1.1
  • cyrus-imapd-utils< 0:3.0.7-20.el8_4.1 | < 0:3.0.7-16.el8_2.1 | < 0:3.0.7-16.el8_1.1
  • cyrus-imapd-utils-debuginfo< 0:3.0.7-20.el8_4.1 | < 0:3.0.7-16.el8_2.1 | < 0:3.0.7-16.el8_1.1
Debian2 products
Ubuntu2 products
  • cyrus-imapd< 2.5.10-3ubuntu1.1+esm1 | < 3.0.13-5ubuntu0.1~esm1
  • cyrus-imapd-2.4All versions (No fix recorded)
Cyrus1 product
  • imap< 3.0.16 | ≥ 3.2.0, < 3.2.8 | ≥ 3.4.0, < 3.4.2
Fedoraproject1 product
Mageia1 product
  • cyrus-imapd< 2.5.15-3.1.mga8
Opensuse1 product
  • cyrus-imapd&distro=openSUSE Tumbleweed< 2.4.22-2.1

7 vendors · 15 products

References

34 links
Show all 34 references