curl: Use of connection struct after free
Published Aug 10, 2016
8.1
HIGHCVSS 3.1
EPSS 8.04%
Description
Use-after-free vulnerability in libcurl before 7.50.1 allows attackers to control which connection is used or possibly have unspecified other impact via unknown vectors.
Affected products
No data.
Configuration 3
- 12.04
- 14.04
- 16.04
- 8.0
- 23
- 24
- 13.2
No data.
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-curl-0:7.61.1-1.el6
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-httpd-0:2.4.34-7.el6
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 6
httpd24-nghttp2-0:1.7.1-7.el6
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-curl-0:7.61.1-1.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-httpd-0:2.4.34-7.el7
Fixed · RHSA-2018:3558
Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
httpd24-nghttp2-0:1.7.1-7.el7
Fixed · RHSA-2018:3558
.NET Core 1.0 on Red Hat Enterprise Linux
rh-dotnetcore10-curl
Out of support scope
.NET Core 1.1 on Red Hat Enterprise Linux
rh-dotnetcore11-curl
Out of support scope
.NET Core 2.0 on Red Hat Enterprise Linux
rh-dotnet20-curl
Out of support scope
.NET Core 2.1 on Red Hat Enterprise Linux
rh-dotnet21-curl
Will not fix
Red Hat Enterprise Linux 5
curl
Not affected
Red Hat Enterprise Linux 6
curl
Not affected
Red Hat Enterprise Linux 7
curl
Not affected
Red Hat Enterprise Virtualization 3
mingw-virt-viewer
Will not fix
Red Hat JBoss Enterprise Web Server 3
curl
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-curl-0:7.61.1-1.el6 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-httpd-0:2.4.34-7.el6 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 6 | httpd24-nghttp2-0:1.7.1-7.el6 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-curl-0:7.61.1-1.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-httpd-0:2.4.34-7.el7 | Fixed | RHSA-2018:3558 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS | httpd24-nghttp2-0:1.7.1-7.el7 | Fixed | RHSA-2018:3558 |
| .NET Core 1.0 on Red Hat Enterprise Linux | rh-dotnetcore10-curl | Out of support scope | n/a |
| .NET Core 1.1 on Red Hat Enterprise Linux | rh-dotnetcore11-curl | Out of support scope | n/a |
| .NET Core 2.0 on Red Hat Enterprise Linux | rh-dotnet20-curl | Out of support scope | n/a |
| .NET Core 2.1 on Red Hat Enterprise Linux | rh-dotnet21-curl | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 6 | curl | Not affected | n/a |
| Red Hat Enterprise Linux 7 | curl | Not affected | n/a |
| Red Hat Enterprise Virtualization 3 | mingw-virt-viewer | Will not fix | n/a |
| Red Hat JBoss Enterprise Web Server 3 | curl | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
The versions of `curl` as shipped with Red Hat Enterprise Linux 5, 6, and 7 are marked as "notaffected" because they did not include the vulnerable code, which was introduced in a later version of the package. Specifically, the struct field affected by this flaw was introduced in `curl` upstream version 7.32.0. The version of `curl` as shipped with Red Hat Enterprise Linux 7 is 7.29.0.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
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 (37 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 8.04% (0.08037) | 94.62th | v5 (v2026.06.15) |
| Jun 15, 2026 | 8.07% (0.08073) | 94.05th | v5 (v2026.06.15) |
| Mar 4, 2026 | 1.30% (0.01296) | 79.42th | v4 (v2025.03.14) |
| Mar 1, 2026 | 5.45% (0.05449) | 90.06th | v4 (v2025.03.14) |
| Feb 4, 2026 | 1.30% (0.01296) | 79.33th | v4 (v2025.03.14) |
| Feb 1, 2026 | 5.45% (0.05449) | 89.99th | v4 (v2025.03.14) |
| Jan 4, 2026 | 1.30% (0.01296) | 79.24th | v4 (v2025.03.14) |
| Jan 1, 2026 | 5.45% (0.05449) | 89.95th | v4 (v2025.03.14) |
| Dec 4, 2025 | 1.30% (0.01296) | 79.09th | v4 (v2025.03.14) |
| Dec 1, 2025 | 5.45% (0.05449) | 89.87th | v4 (v2025.03.14) |
| Nov 4, 2025 | 1.30% (0.01296) | 79.04th | v4 (v2025.03.14) |
| Nov 1, 2025 | 5.45% (0.05449) | 89.78th | v4 (v2025.03.14) |
| Oct 4, 2025 | 1.30% (0.01296) | 79.01th | v4 (v2025.03.14) |
| Oct 1, 2025 | 5.45% (0.05449) | 89.80th | v4 (v2025.03.14) |
| Sep 5, 2025 | 1.09% (0.01092) | 77.12th | v4 (v2025.03.14) |
| Sep 1, 2025 | 4.63% (0.04634) | 88.93th | v4 (v2025.03.14) |
| Aug 4, 2025 | 1.09% (0.01092) | 77.03th | v4 (v2025.03.14) |
| Aug 1, 2025 | 4.63% (0.04634) | 88.95th | v4 (v2025.03.14) |
| Jul 4, 2025 | 1.09% (0.01092) | 76.97th | v4 (v2025.03.14) |
| Jul 1, 2025 | 4.63% (0.04634) | 88.86th | v4 (v2025.03.14) |
| Jun 19, 2025 | 1.09% (0.01092) | 76.93th | v4 (v2025.03.14) |
| Jun 6, 2025 | 2.49% (0.02487) | 84.53th | v4 (v2025.03.14) |
| Jun 4, 2025 | 1.33% (0.01330) | 78.95th | v4 (v2025.03.14) |
| Jun 1, 2025 | 5.50% (0.05495) | 89.75th | v4 (v2025.03.14) |
| May 18, 2025 | 1.33% (0.01330) | 78.90th | v4 (v2025.03.14) |
| May 4, 2025 | 2.49% (0.02487) | 84.44th | v4 (v2025.03.14) |
| May 1, 2025 | 10.90% (0.10899) | 93.02th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.49% (0.02487) | 83.91th | v4 (v2025.03.14) |
| Mar 29, 2025 | 7.24% (0.07239) | 85.73th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.49% (0.02487) | 84.23th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.84% (0.00841) | 82.80th | v3 (v2023.03.01) |
| May 1, 2024 | 0.73% (0.00733) | 80.57th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.73% (0.00733) | 78.57th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.04% (0.01037) | 81.60th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
References (19)
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00011.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00094.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- http://www.debian.org/security/2016/dsa-3638 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html x_refsource_CONFIRMPatchThird Party Advisory
- http://www.securityfocus.com/bid/92306 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1036536 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.563059 vendor-advisoryx_refsource_SLACKWAREThird Party Advisory
- http://www.ubuntu.com/usn/USN-3048-1 vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3558 vendor-advisoryx_refsource_REDHATThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2016-5421 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1362199 Issue Tracking
- https://curl.haxx.se/docs/adv_20160803C.html x_refsource_MISCMitigationVendor Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GLPXQQKURBQFM4XM6645VRPTOE2AWG33/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K3GQH4V3XAQ5Z53AMQRDEC3C3UHTW7QR/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2016-5421
- https://security.gentoo.org/glsa/201701-47 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://source.android.com/security/bulletin/2016-12-01.html x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2016-5421
- https://www.tenable.com/security/tns-2016-18 x_refsource_CONFIRMThird Party Advisory
Change history (0)
No recorded changes yet.