{"answers":{"affected":"It affects 4 products.","exploited":"There is no known exploitation of CVE-2020-13777 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2020-13777 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 4 Jun 2020."},"fix_prompt":"Check this codebase for CVE-2020-13777 and fix it if it is affected.\n\nWhat it is: CVE-2020-13777 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 4 Jun 2020. \nExploitation: There is no known exploitation of CVE-2020-13777 in the wild and no public exploit code.\n\nAffected product: Canonical Ubuntu Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2020-13777/ (Markdown: https://insights.sbomify.com/CVE-2020-13777/index.md)","id":"CVE-2020-13777","markdown":"https://insights.sbomify.com/CVE-2020-13777/index.md","name":"CVE-2020-13777","record":{"aliases":["ALPINE-CVE-2020-13777","DEBIAN-CVE-2020-13777","DSA-4697-1","GHSA-cv49-m792-xmjv","JLSEC-2026-518","MGASA-2020-0268","RHSA-2020:2637","RHSA-2020:2638","RHSA-2020:2639","SUSE-SU-2020:1584-1","UBUNTU-CVE-2020-13777","USN-4384-1","openSUSE-SU-2020:0790-1"],"analysis":null,"analysis_generated_by":null,"assigner":"mitre","cpe":[{"product":"ubuntu_linux","vendor":"canonical"},{"product":"debian_linux","vendor":"debian"},{"product":"fedora","vendor":"fedoraproject"},{"product":"gnutls","vendor":"gnu"}],"cvss":{"score":7.4,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-327","name":"Use of a Broken or Risky Cryptographic Algorithm"}],"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.","ecosystems":["Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:8::baseos","Red Hat:rhel_e4s:8.0::appstream","Red Hat:rhel_e4s:8.0::baseos","Red Hat:rhel_eus:8.1::appstream","Red Hat:rhel_eus:8.1::baseos","SUSE:Linux Enterprise High Performance Computing 15-ESPOS","SUSE:Linux Enterprise High Performance Computing 15-LTSS","SUSE:Linux Enterprise Module for Basesystem 15 SP1","SUSE:Linux Enterprise Server 15-LTSS","SUSE:Linux Enterprise Server for SAP Applications 15","openSUSE:Leap 15.1"],"exploits":{"exploitdb":0,"first_seen":"2020-06-09","github_poc":3,"max_poc_stars":4,"metasploit":0,"nuclei":0,"refs":[{"date":"2020-06-09T01:11:10Z","kind":"github_poc","ref":"https://github.com/0xxon/cve-2020-13777","stars":4,"title":"Zeek script to detect servers vulnerable to CVE-2020-13777"},{"date":"2020-06-12T12:54:00Z","kind":"github_poc","ref":"https://github.com/shigeki/challenge_CVE-2020-13777","stars":2,"title":"Challange CVE-2020-13777 "},{"date":"2020-06-21T11:55:40Z","kind":"github_poc","ref":"https://github.com/prprhyt/PoC_TLS1_3_CVE-2020-13777","stars":0,"title":null}],"tier":"poc_unverified"},"has_fix":true,"headline":"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 authent","id":"CVE-2020-13777","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"canonical:ubuntu_linux","products":["canonical:ubuntu_linux","debian:debian_linux","fedoraproject:fedora","gnu:gnutls"],"type":null,"year":"2020"},"n_packages":51,"n_references":10,"next":{"headline":"Command injection in n/a","id":"CVE-2020-13778"},"packages":[{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.6.8-11.el8_2"],"introduced":["0"],"last_affected":[],"package":"gnutls-c++","purl":"pkg:rpm/redhat/gnutls-c%2B%2B","source":"RHSA-2020:2637"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.6.8-11.el8_2"],"introduced":["0"],"last_affected":[],"package":"gnutls-c++-debuginfo","purl":"pkg:rpm/redhat/gnutls-c%2B%2B-debuginfo","source":"RHSA-2020:2637"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.6.8-11.el8_2"],"introduced":["0"],"last_affected":[],"package":"gnutls-dane","purl":"pkg:rpm/redhat/gnutls-dane","source":"RHSA-2020:2637"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:3.6.8-11.el8_2"],"introduced":["0"],"last_affected":[],"package":"gnutls-dane-debuginfo","purl":"pkg:rpm/redhat/gnutls-dane-debuginfo","source":"RHSA-2020:2637"},{"ecosystem":"Red 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Bypass","id":"CVE-2020-11651","kev_date_added":"2021-11-03","published":"2020-04-30"},{"cvss_score":9.8,"headline":"OpenSMTPD Remote Code Execution","id":"CVE-2020-7247","kev_date_added":"2022-03-25","published":"2020-01-29"},{"cvss_score":9.8,"headline":"Exim Out-of-bounds Write","id":"CVE-2019-16928","kev_date_added":"2022-03-03","published":"2019-09-27"},{"cvss_score":9.8,"headline":"Exim Buffer Overflow","id":"CVE-2018-6789","kev_date_added":"2021-11-03","published":"2018-02-08"},{"cvss_score":9.8,"headline":"Oracle Java SE and Java SE Embedded Remote Code Execution","id":"CVE-2015-2590","kev_date_added":"2022-03-03","published":"2015-07-16"},{"cvss_score":9.8,"headline":"Oracle JRE Remote Code Execution","id":"CVE-2013-0422","kev_date_added":"2022-05-25","published":"2013-01-10"},{"cvss_score":9.8,"headline":"Oracle Java SE Runtime Environment (JRE) Arbitrary Code Execution","id":"CVE-2011-3544","kev_date_added":"2022-03-03","published":"2011-10-19"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-14","vendors":["n/a"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2020-13777/"}