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Vulnerability details: VCID-a9b6-m25r-kygw
Vulnerability ID VCID-a9b6-m25r-kygw
Aliases CVE-2016-9952
Summary 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."
Status Published
Exploitability 0.5
Weighted Severity 4.9
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-295 Improper Certificate Validation
System Score Found at
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
epss 0.01005 https://api.first.org/data/v1/epss?cve=CVE-2016-9952
cvssv3.1 8.1 https://curl.haxx.se/CVE-2016-9952.patch
ssvc Track https://curl.haxx.se/CVE-2016-9952.patch
cvssv3.1 8.1 https://curl.haxx.se/docs/adv_20161221B.html
ssvc Track https://curl.haxx.se/docs/adv_20161221B.html
cvssv3.1 Medium https://curl.se/docs/CVE-2016-9952.html
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2016-9952
https://curl.se/docs/CVE-2016-9952.html
adv_20161221B.html https://curl.haxx.se/docs/adv_20161221B.html
CVE-2016-9952.patch https://curl.haxx.se/CVE-2016-9952.patch
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://curl.haxx.se/CVE-2016-9952.patch
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2024-07-23T19:19:07Z/ Found at https://curl.haxx.se/CVE-2016-9952.patch
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://curl.haxx.se/docs/adv_20161221B.html
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2024-07-23T19:19:07Z/ Found at https://curl.haxx.se/docs/adv_20161221B.html
Exploit Prediction Scoring System (EPSS)
Percentile 0.76977
EPSS Score 0.01005
Published At April 1, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T17:48:56.008188+00:00 EPSS Importer Import https://epss.cyentia.com/epss_scores-current.csv.gz 38.0.0