7.5

CVE-2023-50868: debian debian_linux Uncontrolled Resource Consumption

CVSS: 7.5v3.1HighAnalyzed
AliasesALPINE-CVE-2023-50868UBUNTU-CVE-2023-50868DEBIAN-CVE-2023-50868
Published 14-02-2024Last modified 04-11-2025
Open JSON

Vulnerability summary

CVE-2023-50868 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in debian debian_linux. EPSS estimates a 73.72% chance of exploitation in the next 30 days, higher than 99.4% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
55/100
0100
High · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
73.72%
0%100%
Critical · -8.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 64 · Related 23
DLA-3736-1DLA-3816-1DLA-3859-1DLA-3974-1DSA-5620-1DSA-5621-1

Timeline

  1. 14-02-2024
    PublishedVulnerability first disclosed.
  2. 04-11-2025
    Last modifiedVulnerability information updated.

Description

The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the "NSEC3" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

73.72%

Chance of exploitation in the next 30 days

Percentile

99%

Versus all other CVEs

30-day change

-8.00 pp

From 81.73% on 19-09-2026

19-09-202619-10-2026
EPSS score
73.72%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (isc.org)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Debian8 products
  • bind9< 1:9.18.24-1 | < 1:9.19.21-1
  • dnsjavaAll versions (No fix recorded) | < 3.6.2-1
  • dnsmasq< 2.90-4~deb12u1 | < 2.90-1
  • knot-resolver< 5.6.0-1+deb12u1 | < 5.7.1-1
  • pdns-recursor< 4.8.6-1 | < 4.9.3-1
Ubuntu7 products
  • bind9< 1:9.9.5.dfsg-3ubuntu0.19+esm12 | < 1:9.10.3.dfsg.P4-8ubuntu1.19+esm8 | < 1:9.11.3+dfsg-1ubuntu1.19+esm3 | < 1:9.16.48-0ubuntu0.20.04.1 | < 1:9.18.18-0ubuntu0.22.04.2
  • bind9-libsAll versions (No fix recorded)
  • dnsmasqAll versions (No fix recorded) | < 2.90-0ubuntu0.16.04.1+esm1 | < 2.90-0ubuntu0.18.04.1+esm1 | < 2.90-0ubuntu0.20.04.1 | < 2.90-0ubuntu0.22.04.1
  • isc-dhcpAll versions (No fix recorded)
  • knot-resolverAll versions (No fix recorded)
Alpine3 products
  • bind≥ 9.0.0, < 9.16.48-r0 | ≥ 9.0.0, < 9.18.24-r0
  • dnsmasq< 2.90-r0
  • unbound< 1.19.1-r0
Netapp3 products
Chainguard1 product
  • bind< 9.18.24-r0
Fedoraproject1 product
Isc1 product
  • bind≥ 9.0.0, < 9.16.48 | ≥ 9.9.3, < 9.16.48 | ≥ 9.18.0, < 9.18.24 | ≥ 9.18.11, < 9.18.24 | ≥ 9.19.0, < 9.19.21
Powerdns1 product
  • recursor< 4.8.5 | ≥ 4.9.0, < 4.9.3 | ≥ 5.0.0, < 5.0.2
Redhat1 product
Wolfi1 product
  • bind< 9.18.24-r0

10 vendors · 27 products

References

44 links
Show all 44 references