HIGH
curl: NTLM credentials not-checked for proxy connection re-use
Published Jan 29, 2016
7.3
HIGHCVSS 3.0
EPSS 9.33%
Description
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.
Affected products
No data.
Configuration 2
OR
- 12.04
- 14.04
- 15.04
- 15.10
- 7.0
No data.
Red Hat Enterprise Linux 5
curl
Will not fix
Red Hat Enterprise Linux 6
curl
Will not fix
Red Hat Enterprise Linux 7
curl
Will not fix
Red Hat JBoss Enterprise Web Server 3
curl
Will not fix
Red Hat Software Collections
httpd24-curl
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | curl | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | curl | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | curl | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 3 | curl | Will not fix | n/a |
| Red Hat Software Collections | httpd24-curl | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.3 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact Low
Integrity Impact Low
Availability Impact Low
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
9.33% 0.09327
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.09327
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (21 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 9.33% (0.09327) | 95.24th | v5 (v2026.06.15) |
| Sep 22, 2026 | 9.33% (0.09327) | 95.15th | v5 (v2026.06.15) |
| Sep 21, 2026 | 12.26% (0.12255) | 96.05th | v5 (v2026.06.15) |
| Sep 6, 2026 | 9.33% (0.09327) | 95.04th | v5 (v2026.06.15) |
| Sep 5, 2026 | 12.26% (0.12255) | 95.97th | v5 (v2026.06.15) |
| Aug 30, 2026 | 9.33% (0.09327) | 95.02th | v5 (v2026.06.15) |
| Aug 28, 2026 | 12.26% (0.12255) | 95.95th | v5 (v2026.06.15) |
| Aug 24, 2026 | 9.33% (0.09327) | 94.99th | v5 (v2026.06.15) |
| Aug 23, 2026 | 12.26% (0.12255) | 95.94th | v5 (v2026.06.15) |
| Jun 15, 2026 | 9.33% (0.09327) | 94.73th | v5 (v2026.06.15) |
| Oct 19, 2025 | 0.41% (0.00412) | 60.70th | v4 (v2025.03.14) |
| Oct 1, 2025 | 1.97% (0.01968) | 82.92th | v4 (v2025.03.14) |
| Mar 30, 2025 | 0.93% (0.00933) | 74.06th | v4 (v2025.03.14) |
| Mar 29, 2025 | 9.08% (0.09081) | 87.62th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.76% (0.01763) | 81.36th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.21% (0.01207) | 85.87th | v3 (v2023.03.01) |
| Jun 12, 2024 | 1.70% (0.01703) | 87.80th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.70% (0.01703) | 85.79th | v3 (v2023.03.01) |
| Mar 6, 2023 | 3.78% (0.03779) | 85.48th | v2 (v2022.01.01) |
| Apr 1, 2022 | 3.78% (0.03779) | 84.01th | v2 (v2022.01.01) |
| Feb 4, 2022 | 3.78% (0.03779) | 67.21th | v2 (v2022.01.01) |
Weaknesses (1)
References (22)
- http://curl.haxx.se/docs/adv_20160127A.html x_refsource_CONFIRMVendor Advisory
- http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html vendor-advisoryx_refsource_APPLE
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176546.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177342.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177383.html vendor-advisoryx_refsource_FEDORA
- http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176413.html vendor-advisoryx_refsource_FEDORA
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00031.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00044.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00047.html vendor-advisoryx_refsource_SUSE
- http://packetstormsecurity.com/files/135695/Slackware-Security-Advisory-curl-Updates.html x_refsource_MISC
- http://www.debian.org/security/2016/dsa-3455 vendor-advisoryx_refsource_DEBIAN
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html x_refsource_CONFIRM
- http://www.securityfocus.com/bid/82307 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id/1034882 vdb-entryx_refsource_SECTRACK
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.519965 vendor-advisoryx_refsource_SLACKWARE
- http://www.ubuntu.com/usn/USN-2882-1 vendor-advisoryx_refsource_UBUNTU
- https://access.redhat.com/security/cve/CVE-2016-0755 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1302263 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2016-0755
- https://security.gentoo.org/glsa/201701-47 vendor-advisoryx_refsource_GENTOO
- https://support.apple.com/HT207170 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2016-0755
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner redhat
Published Jan 29, 2016
Updated Aug 5, 2024
Reserved Dec 16, 2015
Link CVE-2016-0755
CISA Vulnrichment
Updated n/a