{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-37624 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-37624 is a high-severity missing authorization vulnerability in signalwire freeswitch, published on 25 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-37624 and fix it if it is affected.\n\nWhat it is: CVE-2021-37624 is a high-severity missing authorization vulnerability in signalwire freeswitch, published on 25 Oct 2021. 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-2021-37624 in the wild and no public exploit code.\n\nAffected product: signalwire freeswitch. 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-2021-37624/ (Markdown: https://insights.sbomify.com/CVE-2021-37624/index.md)","id":"CVE-2021-37624","markdown":"https://insights.sbomify.com/CVE-2021-37624/index.md","name":"CVE-2021-37624","record":{"aliases":["ALPINE-CVE-2021-37624","GHSA-mjcm-q9h8-9xv3"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"FreeSWITCH telecom stack","requires_auth":"none","summary":"Attackers can send unauthenticated SIP messages to registered users, enabling spam and spoofing, unless authentication is explicitly enabled.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"freeswitch","vendor":"freeswitch"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-306","name":"Missing Authentication for Critical Functionality"},{"id":"CWE-287","name":"Improper Authentication"}],"description":"FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.10.7, FreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofing. By default, SIP requests of the type MESSAGE (RFC 3428) are not authenticated in the affected versions of FreeSWITCH. MESSAGE requests are relayed to SIP user agents registered with the FreeSWITCH server without requiring any authentication. Although this behaviour can be changed by setting the `auth-messages` parameter to `true`, it is not the default setting. Abuse of this security issue allows attackers to send SIP MESSAGE messages to any SIP user agent that is registered with the server without requiring authentication. Additionally, since no authentication is required, chat messages can be spoofed to appear to come from trusted entities. Therefore, abuse can lead to spam and enable social engineering, phishing and similar attacks. This issue is patched in version 1.10.7. Maintainers recommend that this SIP message type is authenticated by default so that FreeSWITCH administrators do not need to be explicitly set the `auth-messages` parameter. When following such a recommendation, a new parameter can be introduced to explicitly disable authentication.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":"2021-11-28","github_poc":1,"max_poc_stars":30,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-11-28T13:12:38Z","kind":"github_poc","ref":"https://github.com/0xInfection/PewSWITCH","stars":30,"title":"A FreeSWITCH specific scanning and exploitation toolkit for CVE-2021-37624 and CVE-2021-41157."}],"tier":"poc_unverified"},"has_fix":true,"headline":"FreeSWITCH does not authenticate SIP MESSAGE requests, leading to spam and message spoofing","id":"CVE-2021-37624","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"missing_authorization","year":"2021"},"n_packages":0,"n_references":5,"next":{"headline":"Incorrect Check of Function Return Value in Skytable","id":"CVE-2021-37625"},"packages":[],"prev":{"headline":"Denial of service due to infinite loop in JpegBase::printStructure (#2)","id":"CVE-2021-37623"},"products":["freeswitch"],"published":"2021-10-25","related":[{"cvss_score":9.8,"headline":"FreeSWITCH: Pre-authentication heap buffer overflow in `mod_verto` HTTP POST body read","id":"CVE-2026-49841","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":9.8,"headline":"Hardcoded credentials in n/a","id":"CVE-2019-19492","kev_date_added":null,"published":"2019-12-02"},{"cvss_score":9.1,"headline":"FreeSWITCH: Pre-authentication heap buffer overflow in libesl `Content-Length` parsing","id":"CVE-2026-49840","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":8.6,"headline":"FreeSWITCH susceptible to Denial of Service via SIP flooding","id":"CVE-2021-41145","kev_date_added":null,"published":"2021-10-25"},{"cvss_score":7.5,"headline":"Freeswitch Denial-of-Service in SIP PUBLISH Requests via XML Entity Expansion","id":"CVE-2026-45771","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":7.5,"headline":"FreeSWITCH: Out-of-bounds memory access in core STUN attribute parsing","id":"CVE-2026-49475","kev_date_added":null,"published":"2026-06-09"},{"cvss_score":7.5,"headline":"FreeSWITCH: Pre-authentication bandwidth amplification via `mod_verto` speed-test frames","id":"CVE-2026-49842","kev_date_added":null,"published":"2026-06-09"}],"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["signalwire"]},"summary":"Attackers can send unauthenticated SIP messages to registered users, enabling spam and spoofing, unless authentication is explicitly enabled.","url":"https://insights.sbomify.com/CVE-2021-37624/"}