ActFax 5.01 RAW Server Buffer Overflow
Published Aug 5, 2025
9.3
CRITICALCVSS 4.0
EPSS 1.50%
Description
A stack-based buffer overflow vulnerability exists in ActFax Server version 5.01. The server's RAW protocol interface fails to safely process user-supplied data in @F506 fax header fields due to insecure usage of strcpy. Remote attackers can exploit this vulnerability by sending specially crafted @F506 fields, potentially leading to arbitrary code execution. Successful exploitation requires network access to TCP port 4559 and does not require authentication.
Affected products
-
- Version 5.01StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| ActFax Communication | ActFax Server | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Aug 6, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (7 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.50% (0.01496) | 73.25th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.30% (0.01301) | 66.62th | v5 (v2026.06.15) |
| Jun 1, 2026 | 76.01% (0.76011) | 98.94th | v4 (v2025.03.14) |
| Jan 1, 2026 | 64.53% (0.64529) | 98.39th | v4 (v2025.03.14) |
| Dec 5, 2025 | 71.81% (0.71815) | 98.67th | v4 (v2025.03.14) |
| Oct 8, 2025 | 68.83% (0.68828) | 98.55th | v4 (v2025.03.14) |
| Aug 6, 2025 | 0.59% (0.00594) | 68.31th | v4 (v2025.03.14) |
References (5)
- http://www.actfax.com/ product
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/misc/actfax_raw_server_bof.rb exploit
- https://web.archive.org/web/20130212065755/http://www.pwnag3.com/2013/02/actfax-raw-server-exploit.html technical-descriptionexploit
- https://www.exploit-db.com/exploits/24467 exploit
- https://www.vulncheck.com/advisories/actfax-raw-server-buffer-overflow third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.actfax.com/ | product | |
| https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/misc/actfax_raw_server_bof.rb | exploit | |
| https://web.archive.org/web/20130212065755/http://www.pwnag3.com/2013/02/actfax-raw-server-exploit.html | technical-descriptionexploit | |
| https://www.exploit-db.com/exploits/24467 | exploit | |
| https://www.vulncheck.com/advisories/actfax-raw-server-buffer-overflow | third-party-advisory |
Change history (0)
No recorded changes yet.