What is CVE-2021-45461?
FreePBX, when restapps (aka Rest Phone Apps) 15.0.19.87, 15.0.19.88, 16.0.18.40, or 16.0.18.41 is installed, allows remote attackers to execute arbitrary code, as exploited in the wild in December 2021. The fixed versions are 15.0.20 and 16.0.19.
The record classifies CVE-2021-45461 under weakness class NVD-CWE-noinfo. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 6 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1748 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 2.9% probability of exploitation in the next 30 days, higher than 86.5% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 8.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2021-12-22, last modified 2024-11-21
Is CVE-2021-45461 being exploited?
It currently carries a trending score of 27 in the Threadlinqs vulnerability feed.
Affected products and versions
- Sangoma: Restapps 15.0.19.87, Restapps 15.0.19.88, Restapps 16.0.18.40, Restapps 16.0.18.41, Freepbx, Pbxact
How to fix CVE-2021-45461
The record marks a vendor fix as available for CVE-2021-45461. Patch reference: https://github.com/BusyBox-Hardened/BusyBox-Hardened. Vendor advisory: https://community.freepbx.org/t/0-day-freepbx-exploit/80092. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2021-45461
No threat campaign in the Threadlinqs corpus currently references CVE-2021-45461, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.
Sources
Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.