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CVE-2016-5420
curl and libcurl before 7.50.1 do not check the client certificate when choosing the TLS connection to reuse, which might allow remote…
High7.5EPSS 15.4%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
curl and libcurl before 7.50.1 do not check the client certificate when choosing the TLS connection to reuse, which might allow remote attackers to hijack the authentication of the connection by leveraging a previously created connection with a different client certificate.
Timeline
ID reserved
By redhat
- 2 months later
· 2 months later
Published
- 8 years later
· 8 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | High7.5 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 15.4% · top 3.2% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
n/a
- affected n/a
References (18)
- RHSA-2016:2575 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- RHSA-2018:3558 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- 92309 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://source.android.com/security/bulletin/2016-12-01.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- SSA:2016-219-01 (opens in a new tab)vendor-advisoryx_refsource_SLACKWAREx_transferred
- 1036739 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- DSA-3638 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- openSUSE-SU-2016:2227 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- https://www.tenable.com/security/tns-2016-18 (opens in a new tab)x_refsource_CONFIRMx_transferred
- openSUSE-SU-2016:2379 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- 1036537 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- FEDORA-2016-24316f1f56 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://curl.haxx.se/docs/adv_20160803B.html (opens in a new tab)x_refsource_MISCx_transferred
- FEDORA-2016-8354baae0f (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- RHSA-2016:2957 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- GLSA-201701-47 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- USN-3048-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2016-5420)Record last updated .