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CVE-2016-9953

24
FAUCET Score

CVE-2016-9953 is a critical out-of-bounds read vulnerability in libcurl versions 7.30.0 through 7.51.0, specifically when built for Windows CE using the schannel TLS backend. This flaw allows remote attackers to obtain sensitive information, cause a denial of service, or potentially have other impacts via a maliciously crafted wildcard certificate name. With a CVSS score of 9.8, it is easily exploitable over the network with low complexity, leading to high confidentiality, integrity, and availability impacts. Despite its severity, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 7.30.0, <= 7.51.0CPE matchmatch criteria
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 65th percentile among its peer group of 36,833 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

jitsipatch availablevia llm_extracted
Fixed in: 7.51.0
View patch
sierra_wirelesspatch availablevia llm_extracted
Fixed in: 7.51.0
View patch

Vendor Advisories (2)

sierra_wirelessllm-sierra_wireless-c62019b7b889ea1dMEDIUM

Win CE Schannel cert name out of buffer read

Dec 21, 2016
jitsillm-jitsi-d1dcc3f10752c815MEDIUM

Win CE Schannel cert name out of buffer read

Dec 21, 2016

References

curl.haxx.se / CVE-2016-9952.patch
Vendor Advisory
curl.haxx.se / docs/adv_20161221C.html
Vendor Advisory