5.3

CVE-2024-0853: curl Improper Certificate Validation

CVSS: 5.3v3.1MediumModified
AliasesALPINE-CVE-2024-0853UBUNTU-CVE-2024-0853DEBIAN-CVE-2024-0853
Published 03-02-2024Last modified 20-06-2025
Open JSON

Vulnerability summary

CVE-2024-0853 is a medium (CVSS 5.3) Improper Certificate Validation vulnerability in curl. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65.3% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.10%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 0 · Related 2
CGA-JHF8-HFV6-C8CJCGA-W4PX-X37V-694C

Timeline

  1. 03-02-2024
    PublishedVulnerability first disclosed.
  2. 20-06-2025
    Last modifiedVulnerability information updated.

Description

curl inadvertently kept the SSL session ID for connections in its cache even when the verify status (*OCSP stapling*) test failed. A subsequent transfer to the same hostname could then succeed if the session ID cache was still fresh, which then skipped the verify status check.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

1.10%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

0.00 pp

From 1.10% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Chainguard2 products
  • curl< 8.6.0-r0
  • libcurl4All versions (No fix recorded)
Wolfi2 products
  • curl< 8.6.0-r0
  • libcurl4All versions (No fix recorded)
Alpine1 product
  • curl< 8.6.0-r0
Curl1 product
Debian1 product
  • curl< 8.6.0-1
Haxx1 product
Opensuse1 product
  • curl&distro=openSUSE Tumbleweed< 8.6.0-1.1
Ubuntu1 product
  • curl< 8.5.0-2ubuntu2

8 vendors · 10 products

References

13 links
Show all 13 references