{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2025-13476 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2025-13476 yet. Limit exposure of the affected software until one is available.","what":"CVE-2025-13476 is a critical vulnerability in Rakuten Viber Cloak - Android, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-13476 and fix it if it is affected.\n\nWhat it is: CVE-2025-13476 is a critical vulnerability in Rakuten Viber Cloak - Android, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2025-13476 in the wild and no public exploit code.\n\nAffected product: Rakuten Viber Cloak - Android. 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-2025-13476/ (Markdown: https://insights.sbomify.com/CVE-2025-13476/index.md)","id":"CVE-2025-13476","markdown":"https://insights.sbomify.com/CVE-2025-13476/index.md","name":"CVE-2025-13476","record":{"aliases":["GHSA-7qg4-wvfj-q8vh"],"analysis":{"component_type":"mobile_application","fix_type":"no_fix_stated","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Viber Cloak mode","requires_auth":"none","summary":"Viber Cloak mode uses predictable TLS fingerprints, allowing DPI systems to easily identify and block proxy traffic, undermining censorship circumvention efforts.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"certcc","cpe":[{"product":"viber","vendor":"rakuten"}],"cvss":{"score":9.8,"severity":"critical","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-327","name":"Use of a Broken or Risky Cryptographic Algorithm"}],"description":"Rakuten Viber Cloak mode in Android v25.7.2.0g and Windows v25.6.0.0–v25.8.1.0 uses a static and predictable TLS ClientHello fingerprint lacking extension diversity, allowing Deep Packet Inspection (DPI) systems to trivially identify and block proxy traffic, undermining censorship circumvention. (CWE-327)","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Rakuten Viber uses broken or risky cryptographic Algorithm","id":"CVE-2025-13476","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"weak_cryptography","year":"2025"},"n_packages":0,"n_references":1,"next":{"headline":"OTP Bypass in Digital Operation Services' WifiBurada","id":"CVE-2025-13477"},"packages":[],"prev":{"headline":"Cross-Tenant Access via Application Consent Mismanagement in Multiple WSO2 Products Allows Unauthorized Data Exposure","id":"CVE-2025-13475"},"products":["Rakuten Viber Cloak - Android","Rakuten Viber Cloak - Windows"],"published":"2026-03-05","related":[{"cvss_score":8.8,"headline":"Information disclosure in n/a","id":"CVE-2019-18800","kev_date_added":null,"published":"2019-11-06"},{"cvss_score":7.8,"headline":"Path traversal in n/a","id":"CVE-2019-12569","kev_date_added":null,"published":"2019-06-03"},{"cvss_score":7.5,"headline":"Other in n/a","id":"CVE-2020-14049","kev_date_added":null,"published":"2020-06-22"},{"cvss_score":6.3,"headline":"Cross-site scripting in n/a","id":"CVE-2025-55996","kev_date_added":null,"published":"2025-09-12"},{"cvss_score":4.2,"headline":"Information disclosure in Rakuten Viber","id":"CVE-2018-3987","kev_date_added":null,"published":"2020-02-12"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-03-06","vendors":["Rakuten Viber"]},"summary":"Viber Cloak mode uses predictable TLS fingerprints, allowing DPI systems to easily identify and block proxy traffic, undermining censorship circumvention efforts.","url":"https://insights.sbomify.com/CVE-2025-13476/"}