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Vulnerability record · CVE-2016-10931 · published 26 August 2019

CVE-2016-10931: Rust-openssl project rust-openssl improper certificate validation vulnerability

RRust Openssl Project · Rust Openssl

An issue was discovered in the openssl crate before 0.9.0 for Rust. There is an SSL/TLS man-in-the-middle vulnerability because certificate verification is off by default and there is no API for hostname verification.

8.1 CVSS 3.0 High EPSS 0.75% · top 47.1% CWE-295 · Improper certificate validation
8.1CVSS 3.0 base score, v2 6.8
0.75%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

An issue was discovered in the openssl crate before 0.9.0 for Rust. There is an SSL/TLS man-in-the-middle vulnerability because certificate verification is off by default and there is no API for hostname verification.

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://rustsec.org/advisories/RUSTSEC-2016-0001.html Release NotesVendor Advisory
https://rustsec.org/advisories/RUSTSEC-2016-0001.html Release NotesVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2018-20997Rust-openssl project rust-openssl use after free vulnerabilityAn issue was discovered in the openssl crate before 0.10.9 for Rust. A use-after-free occurs in CMS Signing.EPSS 1.7%8.3CVE-2026-41898Rust-openssl project rust-openssl vulnerabilityrust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.24 to before 0.10.78, the FFI trampolines behind SslContextBuilder…EPSS 0.45%8.1CVE-2026-41681Rust-openssl project rust-openssl stack-based buffer overflow vulnerabilityrust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_…EPSS 0.62%7.2CVE-2026-41676Rust-openssl project rust-openssl out-of-bounds write vulnerabilityrust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) set…EPSS 0.46%7.2CVE-2026-41678Rust-openssl project rust-openssl out-of-bounds write vulnerabilityrust-openssl provides OpenSSL bindings for the Rust programming language. From to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: …EPSS 0.45%1.7CVE-2026-41677Rust-openssl project rust-openssl out-of-bounds read vulnerabilityrust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.0 to before 0.10.78, the *_from_pem_callback APIs did not validate…EPSS 0.51%9.8CVE-2026-85102Checkpoint gaia embedded improper certificate validation vulnerabilityImproper certificate trust validation during VPN negotiation in Check Point Quantum Security Gateway may allow an unauthenticated remote attacker to …KEVEPSS 0.99%5.5CVE-2023-41991Apple iOS, iPadOS and macOS certificate validation bypassApple iOS, iPadOS and macOS contain an improper certificate validation flaw (CWE-295) that lets a malicious app bypass signature validation. Apple st…KEVEPSS 13%analysed

Source: NIST National Vulnerability Database (record CVE-2016-10931), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.