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Fencer Intel
high 7.3

CVE-2016-0755 json

The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which mi…

published 2016-01-29 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-0775

cvss
7.3
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
9.1%
EPSS 9.1% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which might allow remote attackers to authenticate as other users via a request, a similar issue to CVE-2014-0015.

Patch / fix

  • curl Debian 14, Debian 13, Debian 12 7.47.0-1

debian advisories DEBIAN-CVE-2016-0755

  • curl Ubuntu 14.04 LTS 7.35.0-1ubuntu2.6

ubuntu advisories UBUNTU-CVE-2016-0755

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

  • curl SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +6 more 7.19.7-1.46.1
  • curl SLES for SAP 12 SP1, SLES for SAP 12, SLES 12 SP1 +5 more 7.37.0-18.1

suse advisories SUSE-SU-2016:0347-1SUSE-SU-2016:0340-1

  • curl openSUSE Tumbleweed 7.51.0-1.1

opensuse advisories openSUSE-SU-2024:10303-1

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-2016-0755 updated cvss 4.0

curl: NTLM credentials not-checked for proxy connection re-use

  • Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat JBoss Enterprise Web Server 3 curl
    affected: no fix planned “Will not fix”
  • Red Hat Software Collections httpd24-curl, httpd24-libcurl
    not 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

9.08% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.3 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N

Classification

Weakness

References

Sources

Fencer Intel 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.