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CVE-2019-1547 is a timing side-channel vulnerability in OpenSSL EC-group handling during ECDSA signing through libcrypto. EC groups constructed from explicit curve parameters could omit the cofactor, including where the other supplied parameters matched a known named curve. In this condition, OpenSSL could select a non-side-channel-resistant code path rather than its cofactor-dependent protected path. The fix computes ECC cofactors when absent during EC_GROUP construction and adds minimal validation of the supplied order. Affected upstream releases are OpenSSL 1.0.2 through 1.0.2s, 1.1.0 through 1.1.0k, and 1.1.1 through 1.1.1c. OpenSSL libssl is not affected because it does not use explicit EC parameters.
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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.
If you can’t patch tonight, do this now.
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.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Security vulnerability addressed by the advisory; no technical details are provided.
A side-channel weak-encryption vulnerability in OpenSSL addressed by the Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP2 update.
A side-channel weakness in OpenSSL that can result in weak encryption.
An OpenSSL side-channel vulnerability described as permitting weak encryption; addressed by Red Hat's OpenSSL update RHSA-2020:1840.
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.