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CVE-2017-3733
Encrypt-Then-Mac renegotiation crash
High7.5EPSS 12.9%
- Published
- Updated
- Reserved
- Assigned by
- openssl
Description
During a renegotiation handshake if the Encrypt-Then-Mac extension is negotiated where it was not in the original handshake (or vice-versa) then this can cause OpenSSL 1.1.0 before 1.1.0e to crash (dependent on ciphersuite). Both clients and servers are affected.
Timeline
ID reserved
By openssl
- 5 months later
· 5 months later
Published
- 7 years later
· 7 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:N/A:H |
- EPSS (exploitation in 30 days)
- 12.9% · top 3.7% 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
- protocol error
- CWE-20 (opens in a new tab)All about CWE-20 and its CVEs
Affected products
References (8)
- 96269 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://www.openssl.org/news/secadv/20170216.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbgn03728en_us (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://github.com/openssl/openssl/commit/4ad93618d26a3ea23d36ad5498ff4f59eff3a4d2 (opens in a new tab)x_refsource_MISCx_transferred
- 1037846 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html (opens in a new tab)x_refsource_MISCx_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-2017-3733)Record last updated .