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CVE-2023-5363 is an incorrect key and initialization-vector length processing vulnerability in OpenSSL 3.0 and 3.1. When an application calls EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2(), or EVP_CipherInit_ex2(), OpenSSL processes the supplied OSSL_PARAM array after establishing the key and IV. Consequently, requested changes through the keylen or ivlen parameters may not be applied as intended, causing key or IV truncation or overreads during initialization. The issue affects RC2, RC4, RC5, and CCM, GCM, and OCB cipher modes. OpenSSL SSL/TLS and the OpenSSL 3.0 and 3.1 FIPS providers are not affected.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remotely exploitable vulnerability with low attack complexity and no required privileges or user interaction that impacts confidentiality; the specific affected component and technical flaw are not identified in the provided content.
A network-exploitable vulnerability with low attack complexity and no required privileges or user interaction, resulting in high confidentiality impact according to the provided CVSS v3 vector.
A vulnerability addressed by the Huawei EulerOS SA-2026-3825 security update.
An OpenSSL vulnerability involving incorrect resize handling for symmetric cipher keys and IVs.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.