7.5

CVE-2022-40188: debian debian_linux Inefficient Algorithmic Complexity

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2022-40188USN-6225-1DEBIAN-CVE-2022-40188
Published 23-09-2022Last modified 27-05-2025
Open JSON

Vulnerability summary

CVE-2022-40188 is a high (CVSS 7.5) Inefficient Algorithmic Complexity vulnerability in debian debian_linux. EPSS estimates a 1.95% chance of exploitation in the next 30 days, higher than 79.8% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.95%
0%100%
Low · +0.34 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 23-09-2022
    PublishedVulnerability first disclosed.
  2. 27-05-2025
    Last modifiedVulnerability information updated.

Description

Knot Resolver before 5.5.3 allows remote attackers to cause a denial of service (CPU consumption) because of algorithmic complexity. During an attack, an authoritative server must return large NS sets or address sets.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

1.95%

Chance of exploitation in the next 30 days

Percentile

80%

Versus all other CVEs

30-day change

+0.34 pp

From 1.61% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.95%

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

Debian2 products
  • knot-resolver< 3.2.1-3+deb10u1 | < 5.5.3-1
  • debian_linuxEOL10.0
Fedoraproject1 product
Nic1 product
Ubuntu1 product
  • knot-resolver< 1.0.0~beta3-1ubuntu0.1~esm1 | < 2.1.1-1ubuntu0.1~esm2 | < 3.2.1-3ubuntu2.1 | < 5.4.4-1ubuntu0.1~esm1

4 vendors · 5 products

References

11 links
Show all 11 references