Critical severity · published Mar 12, 2018
CVE-2016-9953
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, allows remote attackers to…
9.8
CVSS
1.8%
EPSS
No
On KEV
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, allows remote attackers to obtain sensitive information, cause a denial of service (crash), or possibly have unspecified other impact via a wildcard certificate name, which triggers an out-of-bounds read.
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.8% · higher than 78% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
Curl · Haxx
7.30.0 through 7.51.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-9953
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-9953
Vendor Advisory
https://curl.haxx.se/CVE-2016-9952.patch
Vendor Advisory
https://curl.haxx.se/docs/adv_20161221C.html
More from Curl
9.8
CVE-2026-19931
Negotiate ambient user conn reuse
9.8
CVE-2026-9079
stale proxy password leak
9.8
CVE-2026-8925
SASL double-free
9.8
CVE-2026-11856
cross-origin Digest auth state leak
9.8
CVE-2026-10536
HTTP/2 stream-dependency tree UAF