CVE•Published 2020-06-04•Modified 2026-10-14•1 article on news•5 live references•NVD data
CVE-2020-13777Gnu · Gnutls
Vulnerability data via NVD (ingested)
CVSS v3.1
7.4
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
98
Exploit Prediction Scoring System · top 2% of all CVEs
Weaknesses (CWE)
Description
GnuTLS 3.6.x before 3.6.14 uses incorrect cryptography for encrypting a session ticket (a loss of confidentiality in TLS 1.2, and an authentication bypass in TLS 1.3). The earliest affected version is 3.6.4 (2018-09-24) because of an error in a 2018-09-18 commit. Until the first key rotation, the TLS server always uses wrong data in place of an encryption key derived from an application.
Timeline
Published 2020-06-04
Modified 2026-10-14
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag306 hosts
vuln:CVE-2020-13777Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Gnu Gnutls"All exposed Gnu Gnutls instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Gnutls"HTTP body or banner mentions "Gnutls" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2020-13777Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2020-13777Censys host search filtered to this CVE id.
grep.app
CVE-2020-13777Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2020-13777GitHub code search for direct mentions.
Google dork
"CVE-2020-13777" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.