7.5

CVE-2023-0464: Excessive Resource Usage Verifying X.509 Policy Constraints

Modified
AliasesALPINE-CVE-2023-0464SUSE-SU-2023:1703-1SUSE-SU-2023:1704-1
Published 22-03-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-0464 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in openssl. EPSS estimates a 3.98% chance of exploitation in the next 30 days, higher than 90.5% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
3.98%
0%100%
Low · +0.33 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 10 · Related 10
DLA-3449-1DSA-5417-1MGASA-2023-0130OPENSUSE-SU-2024:12969-1RHSA-2023:3722RHSA-2023:7622

Timeline

  1. 22-03-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

A security vulnerability has been identified in all supported versions of OpenSSL related to the verification of X.509 certificate chains that include policy constraints. Attackers may be able to exploit this vulnerability by creating a malicious certificate chain that triggers exponential use of computational resources, leading to a denial-of-service (DoS) attack on affected systems. Policy processing is disabled by default but can be enabled by passing the `-policy' argument to the command line utilities or by calling the `X509_VERIFY_PARAM_set1_policies()' function.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

3.98%

Chance of exploitation in the next 30 days

Percentile

91%

Versus all other CVEs

30-day change

Increase +0.33 pp

From 3.66% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse40 products
  • compat-openssl098&distro=SUSE Linux Enterprise Module for Legacy 12< 0.9.8j-106.45.1
  • compat-openssl098&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP4< 0.9.8j-106.45.1
  • compat-openssl098&distro=SUSE Linux Enterprise Server for SAP Applications 12 SP5< 0.9.8j-106.45.1
  • openssl-1_0_0&distro=SUSE Enterprise Storage 7< 1.0.2p-150000.3.70.1
  • openssl-1_0_0&distro=SUSE Enterprise Storage 7.1< 1.0.2p-150000.3.70.1
Opensuse7 products
  • openssl-1_0_0&distro=openSUSE Leap 15.4< 1.0.2p-150000.3.70.1
  • openssl-1_0_0&distro=openSUSE Tumbleweed< 1.0.2u-14.1
  • openssl-1_1&distro=openSUSE Leap 15.4< 1.1.1l-150400.7.31.2
  • openssl-1_1&distro=openSUSE Leap Micro 5.3< 1.1.1l-150400.7.31.2
  • openssl-1_1&distro=openSUSE Tumbleweed< 1.1.1t-2.1
Chainguard6 products
  • eco-dotnet-libssl-1.0All versions (No fix recorded)
  • eco-dotnet-libssl-1.0-ld-so-confAll versions (No fix recorded)
  • openssl< 3.1.0-r1
  • openssl-provider-fips< 3.0.9-r1
  • ruby-3.1All versions (No fix recorded)
Ubuntu4 products
  • edk2All versions (No fix recorded) | < 2022.02-3ubuntu0.22.04.4
  • nodejsAll versions (No fix recorded)
  • openssl< 1.0.1f-1ubuntu2.27+esm7 | < 1.0.2g-1ubuntu4.20+esm7 | < 1.0.2g-1ubuntu4.fips.4.20.7 | All versions (No fix recorded) | < 1.1.1-1ubuntu2.1~18.04.22 | < 1.1.1-1ubuntu2.fips.2.1~18.04.22 | < 1.1.1f-1ubuntu2.18 | < 1.1.1f-1ubuntu2.fips.18 | < 3.0.2-0ubuntu1.9
  • openssl1.0< 1.0.2n-1ubuntu5.12
Alpine3 products
  • openssl≥ 1.0.2, < 1.1.1t-r1 | ≥ 1.0.2, < 1.1.1t-r2 | ≥ 1.0.2, < 3.0.8-r1 | ≥ 1.0.2, < 3.1.0-r1
  • openssl1.1-compat< 1.1.1t-r1
  • openssl3< 3.0.8-r1
Wolfi3 products
  • openssl< 3.1.0-r1
  • ruby-3.1All versions (No fix recorded)
  • ruby-3.2All versions (No fix recorded)
Debian1 product
  • openssl< 3.0.9-1
Openssl1 product
  • openssl≥ 1.0.2, < 1.0.2zh | ≥ 1.1.1, < 1.1.1u | ≥ 3.0.0, < 3.0.9 | ≥ 3.1.0, < 3.1.1

8 vendors · 65 products

References

42 links
Show all 42 references