Encrypt-Then-Mac renegotiation crash
Priority MEDIUM 47CWE-20Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.12874 96th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenSSL | OpenSSL | openssl-1.1.0; openssl-1.1.0a; openssl-1.1.0b; openssl-1.1.0c; openssl-1.1.0d | — | No fix listed | CNA |
- OpenSSL VendorOpenSSL Affected openssl-1.1.0; openssl-1.1.0a; openssl-1.1.0b; openssl-1.1.0c; openssl-1.1.0d Fixed in — No fix listed CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:openssl:openssl:1.1.0:*:*:*:*:*:*:* | 1.1.0 | Vulnerable | OpenSSL |
| cpe:2.3:a:openssl:openssl:1.1.0a:*:*:*:*:*:*:* | 1.1.0a | Vulnerable | OpenSSL |
| cpe:2.3:a:openssl:openssl:1.1.0b:*:*:*:*:*:*:* | 1.1.0b | Vulnerable | OpenSSL |
| cpe:2.3:a:openssl:openssl:1.1.0c:*:*:*:*:*:*:* | 1.1.0c | Vulnerable | OpenSSL |
| cpe:2.3:a:openssl:openssl:1.1.0d:*:*:*:*:*:*:* | 1.1.0d | Vulnerable | OpenSSL |
| cpe:2.3:a:hp:operations_agent:11.14:*:*:*:*:*:*:* | 11.14 | Vulnerable | Hewlett Packard Enterprise |
| cpe:2.3:a:hp:operations_agent:11.15:*:*:*:*:*:*:* | 11.15 | Vulnerable | Hewlett Packard Enterprise |
- cpe:2.3:a:openssl:openssl:1.1.0:*:*:*:*:*:*:* Versions 1.1.0 Vulnerable ·OpenSSL
- cpe:2.3:a:openssl:openssl:1.1.0a:*:*:*:*:*:*:* Versions 1.1.0a Vulnerable ·OpenSSL
- cpe:2.3:a:openssl:openssl:1.1.0b:*:*:*:*:*:*:* Versions 1.1.0b Vulnerable ·OpenSSL
- cpe:2.3:a:openssl:openssl:1.1.0c:*:*:*:*:*:*:* Versions 1.1.0c Vulnerable ·OpenSSL
- cpe:2.3:a:openssl:openssl:1.1.0d:*:*:*:*:*:*:* Versions 1.1.0d Vulnerable ·OpenSSL
- cpe:2.3:a:hp:operations_agent:11.14:*:*:*:*:*:*:* Versions 11.14 Vulnerable ·Hewlett Packard Enterprise
- cpe:2.3:a:hp:operations_agent:11.15:*:*:*:*:*:*:* Versions 11.15 Vulnerable ·Hewlett Packard Enterprise
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 10 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Virtualization 3
- Red Hat JBoss Core Services
- Red Hat JBoss Enterprise Application Platform 5
- Red Hat JBoss Enterprise Application Platform 6
- Red Hat JBoss Enterprise Web Server 1
- Red Hat JBoss Enterprise Web Server 2
- Red Hat JBoss Web Server 3
Timeline
- 2026-10-02 Threatist record created from CVE-2017-3733
- 2026-10-03 Alias added: GHSA-6553-6v42-5wqc
References
Advisory 2
Other 4
- http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- https://github.com/openssl/openssl/commit/4ad93618d26a3ea23d36ad5498ff4f59eff3a4d2
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
More Openssl vulnerabilities
- TI-2022-01915 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
- TI-2021-02645 SM2 Decryption Buffer Overflow CVSS 3.1CRITICAL 9.8
- TI-2009-03392 The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft… CVSS 3.1CRITICAL 9.8
- TI-2022-01176 The c_rehash script allows command injection CVSS 3.1CRITICAL 9.8
- TI-2014-00154 The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly… KEVCVSS 3.1HIGH 7.5
- TI-2025-14107 Stack buffer overflow in CMS (Auth)EnvelopedData parsing CVSS 3.1HIGH 8.8
Sources
- CVE-2017-3733 · CVE Program
- CVE-2017-3733 · NVD
- FIRST EPSS
- GHSA-6553-6v42-5wqc · GitHub Advisory Database · CC BY 4.0
- CVE-2017-3733 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences