8.1

CVE-2016-9952: haxx curl Improper Certificate Validation

CVSS: 8.1v3.1HighModified
AliasesALPINE-CVE-2016-9952
Published 12-03-2018Last modified 07-08-2024
Open JSON

Vulnerability summary

CVE-2016-9952 is a high (CVSS 8.1) Improper Certificate Validation vulnerability in haxx curl. EPSS estimates a 1.28% chance of exploitation in the next 30 days, higher than 69.4% of scored vulnerabilities.

Overall risk
33/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
1.28%
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. 12-03-2018
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

Description

The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, makes it easier for remote attackers to conduct man-in-the-middle attacks via a crafted wildcard SAN in a server certificate, as demonstrated by "*.com."

CVSS metrics

5 scores · 3 sources · 3 versions

EPSS trend

Probability

1.28%

Chance of exploitation in the next 30 days

Percentile

69%

Versus all other CVEs

30-day change

0.00 pp

From 1.28% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.28%

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

Alpine1 product
  • curl≥ 7.30.0, < 7.52.1-r0
Haxx1 product
  • curl≥ 7.30.0, ≤ 7.51.0

2 vendors · 2 products

References

3 links