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Fencer Vulns
high 7.5

CVE-2016-5419 in the critical feed json

curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers…

published 2016-08-10 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-6364

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
15.1%
EPSS 15.1% chance of exploitation in 30 days, percentile 96%
public exploits
0
none known

Summary

curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers to bypass intended restrictions by resuming a session.

Patch / fix

  • curl Debian 14, Debian 13, Debian 12 7.50.1-1

debian advisories DEBIAN-CVE-2016-5419

  • curl Ubuntu 14.04 LTS 7.35.0-1ubuntu2.8
  • curl Ubuntu 16.04 LTS 7.47.0-1ubuntu2.1

ubuntu advisories UBUNTU-CVE-2016-5419

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • httpd24-curl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el6
  • httpd24-curl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el7
  • httpd24-httpd RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-7.el6
  • httpd24-httpd RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-7.el7
  • httpd24-mod_md RHEL 3 SOFTWARE_COLLECTIONS 2.4.34-7.el7
  • httpd24-libcurl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el6
  • httpd24-libcurl RHEL 3 SOFTWARE_COLLECTIONS 7.61.1-1.el7
  • httpd24-mod_ssl RHEL 3 SOFTWARE_COLLECTIONS 1:2.4.34-7.el6

red hat advisories RHSA-2018:3558RHSA-2016:2575

  • curl SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +6 more 7.19.7-1.61.1
  • curl-openssl1 SLES 11-SECURITY, SLES 11 SP3-TERADATA, SLES 11 SP3-LTSS 7.19.7-1.61.1
  • curl SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 7.37.0-28.1
  • curl Studio Onsite 1.3 7.19.7-1.20.42.1

suse advisories SUSE-SU-2016:2449-1SUSE-SU-2016:2330-1SUSE-SU-2016:2155-1

  • curl Alpine 3.24, Alpine 3.23, Alpine 3.22 +14 more 7.50.1-r0
  • curl Alpine 3.11, Alpine 3.8, Alpine 3.7 +1 more 7.50.1
  • curl Alpine 3.3, Alpine 3.2 7.49.1-r1

alpine advisories ALPINE-CVE-2016-5419

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2016-5419 updated cvss 4.8

curl: TLS session resumption client cert bypass

  • Red Hat .NET Core 1.0 on Red Hat Enterprise Linux rh-dotnetcore10-curl Red Hat .NET Core 1.1 on Red Hat Enterprise Linux rh-dotnetcore11-curl Red Hat .NET Core 2.0 on Red Hat Enterprise Linux rh-dotnet20-curl
    affected: no fix planned “Out of support scope”
  • Red Hat .NET Core 2.1 on Red Hat Enterprise Linux rh-dotnet21-curl, rh-dotnet21-libcurl Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Virtualization 3 mingw-virt-viewer, mingw32-virt-viewer, mingw64-virt-viewer
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Enterprise Web Server 3 curl
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) curl 7.29.0-35.el7, libcurl 7.29.0-35.el7 Red Hat Enterprise Linux Client Optional (v. 7) libcurl-devel 7.29.0-35.el7, curl-debuginfo 7.29.0-35.el7 Red Hat Enterprise Linux ComputeNode (v. 7) curl 7.29.0-35.el7, libcurl 7.29.0-35.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) libcurl-devel 7.29.0-35.el7, curl-debuginfo 7.29.0-35.el7 Red Hat Enterprise Linux Server (v. 7) curl 7.29.0-35.el7, libcurl 7.29.0-35.el7 Red Hat Enterprise Linux Workstation (v. 7) curl 7.29.0-35.el7, libcurl 7.29.0-35.el7
    fixed: vendor fix RHSA-2016:2575
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2016:2957
  • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 6) httpd24-curl 7.61.1-1.el6, httpd24-httpd 2.4.34-7.el6, httpd24-nghttp2 1.7.1-7.el6, httpd24-libcurl 7.61.1-1.el6, httpd24-mod_ssl 2.4.34-7.el6, httpd24-mod_ldap 2.4.34-7.el6, +5 more Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.4) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.5) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 6) httpd24-curl 7.61.1-1.el6, httpd24-httpd 2.4.34-7.el6, httpd24-nghttp2 1.7.1-7.el6, httpd24-libcurl 7.61.1-1.el6, httpd24-mod_ssl 2.4.34-7.el6, httpd24-mod_ldap 2.4.34-7.el6, +5 more
    +1 more products
    Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) httpd24-curl 7.61.1-1.el7, httpd24-httpd 2.4.34-7.el7, httpd24-mod_md 2.4.34-7.el7, httpd24-nghttp2 1.7.1-7.el7, httpd24-libcurl 7.61.1-1.el7, httpd24-mod_ssl 2.4.34-7.el7, +6 more
    fixed: vendor fix RHSA-2018:3558

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

15.06% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

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.