CVE-2020-9434
CVE-2020-9434 is a critical-severity vulnerability in Lua-openssl Project Lua-openssl with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- CVSS v2: 6.4
- EPSS exploit prediction: 1% (53rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-295
- Affected product: Lua-openssl Project Lua-openssl
- Published:
- Last modified:
Description
openssl_x509_check_ip_asc in lua-openssl 0.7.7-1 mishandles X.509 certificate validation because it uses lua_pushboolean for certain non-boolean return values.
Frequently asked questions
- What is CVE-2020-9434?
- openssl_x509_check_ip_asc in lua-openssl 0.7.7-1 mishandles X.509 certificate validation because it uses lua_pushboolean for certain non-boolean return values.
- How severe is CVE-2020-9434?
- CVE-2020-9434 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
- Is CVE-2020-9434 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-9434?
- CVE-2020-9434 affects Lua-openssl Project Lua-openssl. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2020-9434?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2020-9434 published?
- CVE-2020-9434 was published on 2020-02-27 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:lua-openssl_project:lua-openssl:0.7.7-1:*:*:*:*:*:*:*
More vulnerabilities in Lua-openssl Project Lua-openssl
- CVE-2020-9433 — Critical (CVSS 9.1): openssl_x509_check_email in lua-openssl 0.7.7-1 mishandles X.509 certificate validation because it uses lua_pushboolean…
- CVE-2020-9432 — Critical (CVSS 9.1): openssl_x509_check_host in lua-openssl 0.7.7-1 mishandles X.509 certificate validation because it uses lua_pushboolean…
All CVEs affecting Lua-openssl Project Lua-openssl →
Other CWE-295 (Improper Certificate Validation) vulnerabilities
- CVE-2026-4370 — Critical (CVSS 10.0): A vulnerability was identified in Juju from version 3.2.0 until 3.6.19 and from version 4.0 until 4.0.4, where the…
- CVE-2026-30836 — Critical (CVSS 10.0): Step CA is an online certificate authority for secure, automated certificate management for DevOps. Versions 0.30.0-rc6…
- CVE-2025-68121 — Critical (CVSS 10.0): During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between…
- CVE-2022-20703 — Critical (CVSS 10.0): Multiple vulnerabilities in Cisco Small Business RV160, RV260, RV340, and RV345 Series Routers could allow an attacker…
- CVE-2021-1471 — Critical (CVSS 9.9): Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms…
- CVE-2026-20184 — Critical (CVSS 9.8): A vulnerability in the integration of single sign-on (SSO) with Control Hub in Cisco Webex Services could have allowed…
Browse all CWE-295 (Improper Certificate Validation) vulnerabilities →