CVE-2016-3739 json
The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcur…
published 2016-05-20 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-4752
- cvss
- 5.3
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.9%
- EPSS 6.9% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
The (1) mbed_connect_step1 function in lib/vtls/mbedtls.c and (2) polarssl_connect_step1 function in lib/vtls/polarssl.c in cURL and libcurl before 7.49.0, when using SSLv3 or making a TLS connection to a URL that uses a numerical IP address, allow remote attackers to spoof servers via an arbitrary valid certificate.
Patch / fix
- haxx curl 7.49.0
- haxx libcurl 7.49.0
- curl Debian 14, Debian 13, Debian 12 7.50.1-1
debian advisories DEBIAN-CVE-2016-3739
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2016-3739 updated cvss 4.0
curl: TLS certificate name check bypass with mbedTLS and PolarSSL
-
Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer Red Hat JBoss Enterprise Web Server 3 curlnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
6.93% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.3 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N |
| NVD | 2.0 | 2.6 | AV:N/AC:H/Au:N/C:N/I:P/A:N |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
slackware.com
/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.495349
vendor-advisory
-
security.gentoo.org
/glsa/201701-47
vendor-advisory
-
curl.haxx.se
/docs/adv_20160518.html
vendor-advisory
-
curl.haxx.se
/CVE-2016-3739.patch
vendor-advisory
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149
-
securitytracker.com
/id/1035907
vdb-entry
-
securityfocus.com
/bid/90726
vdb-entry
- h20566.www2.hpe.com /portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
- oracle.com /technetwork/security-advisory/cpuoct2018-4428296.html
- curl.haxx.se /changes.html#7_49_0
-
openwall.com
/lists/oss-security/2024/03/27/4
mailing-list
Sources
- CVE List CVE-2016-3739
- NVD CVE-2016-3739
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Improve affected version range and add fix versions.