{"answers":{"affected":"4 open source packages ship an affected version, including istio.io/istio. It affects 1 product.","exploited":"There is no known exploitation of CVE-2020-16844 in the wild and no public exploit code.","fix":"Upgrade istio.io/istio to a fixed version for your release line: 1.5.9 or 1.6.8.","what":"CVE-2020-16844 is a medium-severity authentication bypass vulnerability in n/a, published on 1 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-16844 and fix it if it is affected.\n\nWhat it is: CVE-2020-16844 is a medium-severity authentication bypass vulnerability in n/a, published on 1 Oct 2020. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2020-16844 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- istio.io/istio (Go): affected from 1.5.0; fixed in 1.5.9\n- istio.io/istio (Go): affected from 1.5.0; fixed in 1.5.9\n- istio.io/istio (Go): affected from 1.6.0; fixed in 1.6.8\n- istio.io/istio (Go): affected from 1.6.0; fixed in 1.6.8\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-2020-16844/ (Markdown: https://insights.sbomify.com/CVE-2020-16844/index.md)","id":"CVE-2020-16844","markdown":"https://insights.sbomify.com/CVE-2020-16844/index.md","name":"CVE-2020-16844","record":{"aliases":["GHSA-82mm-ffjr-h86c","RHSA-2020:3425"],"analysis":{"component_type":"cloud_service","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Istio service mesh","requires_auth":"low_privilege","summary":"Attackers can bypass Istio authorization policies by exploiting wildcard suffix handling in DENY rules, allowing unauthorized access to protected services.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"istio","vendor":"istio"}],"cvss":{"score":6.8,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"cwes":[],"description":"In Istio 1.5.0 though 1.5.8 and Istio 1.6.0 through 1.6.7, when users specify an AuthorizationPolicy resource with DENY actions using wildcard suffixes (e.g. *-some-suffix) for source principals or namespace fields, callers will never be denied access, bypassing the intended policy.","ecosystems":["Go","Red Hat:service_mesh:1.1::el8"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Authorization bypass in Istio","id":"CVE-2020-16844","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2020"},"n_packages":13,"n_references":2,"next":{"headline":"Withdrawn Advisory: Infinite loop in xz","id":"CVE-2020-16845"},"packages":[{"ecosystem":"Go","fixed":["1.5.9"],"introduced":["1.5.0"],"last_affected":[],"package":"istio.io/istio","purl":null,"source":"GHSA-82mm-ffjr-h86c"},{"ecosystem":"Go","fixed":["1.5.9"],"introduced":["1.5.0"],"last_affected":[],"package":"istio.io/istio","purl":"pkg:golang/istio.io/istio","source":"GHSA-82mm-ffjr-h86c"},{"ecosystem":"Go","fixed":["1.6.8"],"introduced":["1.6.0"],"last_affected":[],"package":"istio.io/istio","purl":null,"source":"GHSA-82mm-ffjr-h86c"},{"ecosystem":"Go","fixed":["1.6.8"],"introduced":["1.6.0"],"last_affected":[],"package":"istio.io/istio","purl":"pkg:golang/istio.io/istio","source":"GHSA-82mm-ffjr-h86c"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh","purl":"pkg:rpm/redhat/servicemesh","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-citadel","purl":"pkg:rpm/redhat/servicemesh-citadel","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-galley","purl":"pkg:rpm/redhat/servicemesh-galley","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-istioctl","purl":"pkg:rpm/redhat/servicemesh-istioctl","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-mixc","purl":"pkg:rpm/redhat/servicemesh-mixc","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-mixs","purl":"pkg:rpm/redhat/servicemesh-mixs","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-pilot-agent","purl":"pkg:rpm/redhat/servicemesh-pilot-agent","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-pilot-discovery","purl":"pkg:rpm/redhat/servicemesh-pilot-discovery","source":"RHSA-2020:3425"},{"ecosystem":"Red Hat:service_mesh:1.1::el8","fixed":["0:1.1.7-1.el8"],"introduced":["0"],"last_affected":[],"package":"servicemesh-sidecar-injector","purl":"pkg:rpm/redhat/servicemesh-sidecar-injector","source":"RHSA-2020:3425"}],"prev":{"headline":"Denial of service in n/a","id":"CVE-2020-16843"},"products":["n/a"],"published":"2020-10-01","related":[{"cvss_score":9.8,"headline":"Missing authorization in n/a","id":"CVE-2021-31921","kev_date_added":null,"published":"2021-06-02"},{"cvss_score":8.8,"headline":"Information disclosure in n/a","id":"CVE-2021-34824","kev_date_added":null,"published":"2021-06-29"},{"cvss_score":8.7,"headline":"Istio JWKS resolver to prevent private key material from being exposed when JWKS fetch fails.","id":"CVE-2026-31837","kev_date_added":null,"published":"2026-03-10"},{"cvss_score":8.3,"headline":"Authorization Policy Bypass Due to Case Insensitive Host Comparison","id":"CVE-2021-39155","kev_date_added":null,"published":"2021-08-24"},{"cvss_score":8.1,"headline":"Fragments in Path May Lead to Authorization Policy Bypass","id":"CVE-2021-39156","kev_date_added":null,"published":"2021-08-24"},{"cvss_score":7.6,"headline":"Istio may allow identity impersonation if user has localhost access","id":"CVE-2022-39388","kev_date_added":null,"published":"2022-11-10"},{"cvss_score":7.5,"headline":"Istio vulnerable to denial of service attack due to Golang Regex Library","id":"CVE-2022-39278","kev_date_added":null,"published":"2022-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"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":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"Attackers can bypass Istio authorization policies by exploiting wildcard suffix handling in DENY rules, allowing unauthorized access to protected services.","url":"https://insights.sbomify.com/CVE-2020-16844/"}