Vulnerability in Openssl
CVE-2021-23839
OpenSSL 1.0.2 supports SSLv2. If a client attempts to negotiate SSLv2 with a server that is configured to support both SSLv2 and more recent SSL and TLS versions then a check is made for a version rollback attack when unpadding an RSA sign…
Vulnerability class: POODLE (CVE-2014-3566)
EPSS: 0.030 (85.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Openssl — versions Fixed in OpenSSL 1.0.2y (Affected 1.0.2s-1.0.2x)
- Oracle Business_intelligence — versions 5.5.0.0.0, 5.9.0.0.0, 12.2.1.3.0
- Oracle Enterprise_manager_for_storage_management — versions 13.4.0.0
- Oracle Enterprise_manager_ops_center — versions 12.4.0.0
- Oracle Graalvm — versions 19.3.5, 20.3.1.2, 21.0.0.2
- Oracle Jd_edwards_world_security — versions a9.4
- Oracle Zfs_storage_appliance_kit — versions 8.8
- Siemens Sinec_ins — versions 1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- openssl-security@openssl.org (Vendor Advisory)
- openssl-security@openssl.org
- openssl-security@openssl.org (Patch, Third Party Advisory)
- openssl-security@openssl.org (Third Party Advisory)
- openssl-security@openssl.org (Patch, Third Party Advisory)
- openssl-security@openssl.org (Third Party Advisory)
- openssl-security@openssl.org (Patch, Third Party Advisory)
- openssl-security@openssl.org (Patch, Third Party Advisory)
- openssl-security@openssl.org (Patch, Third Party Advisory)
- openssl-security@openssl.org
Frequently asked questions
- What is CVE-2021-23839?
- CVE-2021-23839 is a low-severity vulnerability in Openssl, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 3.7/10. Published 2021-02-16.
- How severe is CVE-2021-23839?
- Low severity. CVSS v3 base score is 3.7 out of 10.
- Is CVE-2021-23839 known to be exploited?
- 20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.