{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-43799 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2021-43799 yet. Limit exposure of the affected software until one is available.","what":"CVE-2021-43799 is a high-severity vulnerability in zulip, published on 25 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-43799 and fix it if it is affected.\n\nWhat it is: CVE-2021-43799 is a high-severity vulnerability in zulip, published on 25 Jan 2022. 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-2021-43799 in the wild and no public exploit code.\n\nAffected product: zulip. 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-2021-43799/ (Markdown: https://insights.sbomify.com/CVE-2021-43799/index.md)","id":"CVE-2021-43799","markdown":"https://insights.sbomify.com/CVE-2021-43799/index.md","name":"CVE-2021-43799","record":{"aliases":["GHSA-p663-wxvv-2fjp"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["code_execution","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Zulip Server","requires_auth":"none","summary":"Weak default secrets in RabbitMQ allow remote attackers to brute-force access, leading to arbitrary code execution and data theft.","user_interaction":"not_required","vuln_class":"weak_cryptography"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"zulip","vendor":"zulip"}],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-338","name":"Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)"}],"description":"Zulip is an open-source team collaboration tool. Zulip Server installs RabbitMQ for internal message passing. In versions of Zulip Server prior to 4.9, the initial installation (until first reboot, or restart of RabbitMQ) does not successfully limit the default ports which RabbitMQ opens; this includes port 25672, the RabbitMQ distribution port, which is used as a management port. RabbitMQ's default \"cookie\" which protects this port is generated using a weak PRNG, which limits the entropy of the password to at most 36 bits; in practicality, the seed for the randomizer is biased, resulting in approximately 20 bits of entropy. If other firewalls (at the OS or network level) do not protect port 25672, a remote attacker can brute-force the 20 bits of entropy in the \"cookie\" and leverage it for arbitrary execution of code as the rabbitmq user. They can also read all data which is sent through RabbitMQ, which includes all message traffic sent by users. Version 4.9 contains a patch for this vulnerability. As a workaround, ensure that firewalls prevent access to ports 5672 and 25672 from outside the Zulip server.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2021-12-08","github_poc":1,"max_poc_stars":1,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-12-08T00:47:00Z","kind":"github_poc","ref":"https://github.com/scopion/CVE-2021-43799","stars":1,"title":"Python Exploit Code "}],"tier":"poc_unverified"},"has_fix":false,"headline":"RabbitMQ exposes ports with weak default secrets in Zulip Server","id":"CVE-2021-43799","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"weak_cryptography","year":"2021"},"n_packages":0,"n_references":4,"next":{"headline":"Asset directory traversal with some storage modules on Windows","id":"CVE-2021-43800"},"packages":[],"prev":{"headline":"Grafana Path Traversal","id":"CVE-2021-43798"},"products":["zulip"],"published":"2022-01-25","related":[{"cvss_score":8,"headline":"Crafted link in Zulip message can cause disclosure of credentials","id":"CVE-2022-35962","kev_date_added":null,"published":"2022-08-29"},{"cvss_score":7.5,"headline":"Auth bypass in zulip","id":"CVE-2016-4427","kev_date_added":null,"published":"2022-07-28"},{"cvss_score":6.8,"headline":"Cross-site Scripting (XSS) - Stored in zulip/zulip","id":"CVE-2021-3866","kev_date_added":null,"published":"2022-01-20"},{"cvss_score":6.5,"headline":"Unauthorized user can register an account in specific configurations in Zulip","id":"CVE-2023-28623","kev_date_added":null,"published":"2023-05-19"},{"cvss_score":6.5,"headline":"Ineffective expiration validation for invitation links in Zulip","id":"CVE-2021-43791","kev_date_added":null,"published":"2021-12-02"},{"cvss_score":6.1,"headline":"Zulip: Path Traversal in Import","id":"CVE-2026-26058","kev_date_added":null,"published":"2026-04-03"}],"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2025-04-23","vendors":["zulip"]},"summary":"Weak default secrets in RabbitMQ allow remote attackers to brute-force access, leading to arbitrary code execution and data theft.","url":"https://insights.sbomify.com/CVE-2021-43799/"}