CRITICAL
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
Published Dec 22, 2021
9.8
CRITICALCVSS 3.1
EPSS 21.66%
Description
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.
Affected products
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
No CVSS v3.0 score for this CVE.
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
21.66% 0.21657
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.21657
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (32 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 21.66% (0.21657) | 97.56th | v5 (v2026.06.15) |
| Aug 24, 2026 | 21.66% (0.21657) | 97.44th | v5 (v2026.06.15) |
| Jul 24, 2026 | 19.75% (0.19746) | 97.12th | v5 (v2026.06.15) |
| Jun 23, 2026 | 21.66% (0.21657) | 97.31th | v5 (v2026.06.15) |
| Jun 15, 2026 | 19.75% (0.19746) | 97.06th | v5 (v2026.06.15) |
| Apr 25, 2026 | 6.47% (0.06473) | 91.12th | v4 (v2025.03.14) |
| Feb 17, 2026 | 3.56% (0.03560) | 87.43th | v4 (v2025.03.14) |
| Jan 31, 2026 | 7.59% (0.07587) | 91.61th | v4 (v2025.03.14) |
| Nov 27, 2025 | 3.73% (0.03726) | 87.50th | v4 (v2025.03.14) |
| Nov 21, 2025 | 4.98% (0.04975) | 89.20th | v4 (v2025.03.14) |
| Nov 18, 2025 | 3.53% (0.03534) | 86.47th | v4 (v2025.03.14) |
| Aug 25, 2025 | 4.98% (0.04975) | 89.26th | v4 (v2025.03.14) |
| Jul 30, 2025 | 3.90% (0.03902) | 87.83th | v4 (v2025.03.14) |
| Jul 25, 2025 | 6.82% (0.06817) | 90.88th | v4 (v2025.03.14) |
| Jul 23, 2025 | 8.85% (0.08849) | 92.14th | v4 (v2025.03.14) |
| Jun 7, 2025 | 37.85% (0.37854) | 97.00th | v4 (v2025.03.14) |
| Mar 30, 2025 | 22.78% (0.22779) | 95.40th | v4 (v2025.03.14) |
| Mar 29, 2025 | 30.04% (0.30040) | 94.73th | v4 (v2025.03.14) |
| Mar 17, 2025 | 22.78% (0.22779) | 95.42th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.91% (0.01911) | 89.04th | v3 (v2023.03.01) |
| Mar 15, 2024 | 1.46% (0.01458) | 86.38th | v3 (v2023.03.01) |
| Aug 13, 2023 | 1.22% (0.01219) | 83.57th | v3 (v2023.03.01) |
| Jul 30, 2023 | 0.66% (0.00656) | 76.79th | v3 (v2023.03.01) |
| Jul 15, 2023 | 0.53% (0.00532) | 74.00th | v3 (v2023.03.01) |
| Jun 4, 2023 | 0.53% (0.00525) | 73.62th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.53% (0.00533) | 73.57th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.63% (0.05634) | 90.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.63% (0.05634) | 89.29th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.63% (0.05634) | 76.84th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.83% (0.01828) | 35.38th | v1 |
| Jan 6, 2022 | 1.83% (0.01828) | 34.69th | v1 |
| Dec 23, 2021 | 1.83% (0.01828) | 75.72th | v1 |
Weaknesses (0)
No CWE recorded.
References (3)
- https://community.freepbx.org/t/0-day-freepbx-exploit/80092 x_refsource_MISCExploitIssue TrackingVendor Advisory
- https://community.freepbx.org/t/security-issue-potential-rest-phone-apps-rce/80109 x_refsource_CONFIRMVendor Advisory
- https://wiki.freepbx.org/display/FOP/2021-12-21+SECURITY%3A+Potential+Rest+Phone+Apps+RCE x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://community.freepbx.org/t/0-day-freepbx-exploit/80092 | x_refsource_MISCExploitIssue TrackingVendor Advisory | |
| https://community.freepbx.org/t/security-issue-potential-rest-phone-apps-rce/80109 | x_refsource_CONFIRMVendor Advisory | |
| https://wiki.freepbx.org/display/FOP/2021-12-21+SECURITY%3A+Potential+Rest+Phone+Apps+RCE | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Dec 22, 2021
Updated Aug 4, 2024
Reserved Dec 22, 2021
Link CVE-2021-45461
CISA Vulnrichment
Updated n/a