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CVE-2020-13777 is an incorrect cryptographic key-management vulnerability in GnuTLS 3.6.4 through 3.6.13. A flaw in the TOTP-based session ticket encryption key rotation mechanism caused the active session ticket encryption key to remain zero-initialized until the first scheduled rotation. During server session-ticket initialization, the supplied initial key was saved as rotation material, but the key actually used to encrypt tickets was not initialized. The vulnerable initialization routine also prematurely recorded the current rotation window, preventing an immediate rotation that would have populated the active key.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible vulnerability with high confidentiality and integrity impact and no availability impact, according to the listed CVSS vectors.
A GnuTLS vulnerability affecting versions >3.6.4 and <3.6.14 where TOTP-based session ticket encryption key rotation left the session ticket encryption key all-zero until the first rotation, enabling confidentiality compromise in TLS 1.2 and man-in-the-middle impact in TLS 1.3.
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.