7.5

CVE-2023-26249: nic knot_resolver

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2023-26249DEBIAN-CVE-2023-26249
Published 21-02-2023Last modified 14-03-2025
Open JSON

Vulnerability summary

CVE-2023-26249 is a high (CVSS 7.5) vulnerability in nic knot_resolver. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.5% 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
0.71%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-02-2023
    PublishedVulnerability first disclosed.
  2. 14-03-2025
    Last modifiedVulnerability information updated.

Description

Knot Resolver before 5.6.0 enables attackers to consume its resources, launching amplification attacks and potentially causing a denial of service. Specifically, a single client query may lead to a hundred TCP connection attempts if a DNS server closes connections without providing a response.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

0.00 pp

From 0.71% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.71%

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

Debian1 product
  • knot-resolver< 5.6.0-1
Nic1 product
Ubuntu1 product
  • knot-resolverAll versions (No fix recorded)

3 vendors · 3 products

References

4 links