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CVE-2023-0401 is a denial-of-service vulnerability in OpenSSL caused by a NULL pointer dereference during verification of PKCS7 signed or signedAndEnveloped data. When the signature uses a hash algorithm that is recognized by OpenSSL but the corresponding digest implementation is unavailable, digest initialization fails. Due to a missing check of the initialization function's return value, subsequent digest API calls operate on an invalid state and can dereference a NULL pointer, most likely crashing the process. The issue affects PKCS7 processing performed through the S/MIME library and the timestamp library. OpenSSL's TLS implementation does not invoke the affected code paths directly.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.