RabidHamster R4 Log Entry sprintf() Buffer Overflow
Published Aug 13, 2025
10.0
CRITICALCVSS 4.0
EPSS 1.41%
Description
RabidHamster R4 v1.25 contains a stack-based buffer overflow vulnerability due to unsafe use of sprintf() when logging malformed HTTP requests. A remote attacker can exploit this flaw by sending a specially crafted URI, resulting in arbitrary code execution under the context of the web server process.
Affected products
-
- Version 1.25StatusaffectedConstraints-
- 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 | ||||||
|---|---|---|---|---|---|---|---|---|---|
| RabidHamster | R4 Embedded 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:H/SI:H/SA:H
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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 14, 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 (8 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.41% (0.01412) | 71.71th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.32% (0.01317) | 66.96th | v5 (v2026.06.15) |
| Jun 9, 2026 | 74.89% (0.74894) | 98.89th | v4 (v2025.03.14) |
| Apr 29, 2026 | 58.65% (0.58646) | 98.22th | v4 (v2025.03.14) |
| Jan 9, 2026 | 55.50% (0.55502) | 97.98th | v4 (v2025.03.14) |
| Dec 13, 2025 | 63.85% (0.63848) | 98.34th | v4 (v2025.03.14) |
| Oct 8, 2025 | 58.17% (0.58174) | 98.07th | v4 (v2025.03.14) |
| Aug 14, 2025 | 0.27% (0.00268) | 50.03th | v4 (v2025.03.14) |
References (6)
- http://aluigi.altervista.org/adv/r4_1-adv.txt technical-descriptionexploit
- https://advisories.checkpoint.com/defense/advisories/public/2013/cpai-07-jan405.html third-party-advisory
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/rabidhamster_r4_log.rb exploit
- https://www.exploit-db.com/exploits/18929 exploit
- https://www.rabidhamster.org/R4/download.php product
- https://www.vulncheck.com/advisories/rabidhamster-r4-log-entry-buffer-overflow third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| http://aluigi.altervista.org/adv/r4_1-adv.txt | technical-descriptionexploit | |
| https://advisories.checkpoint.com/defense/advisories/public/2013/cpai-07-jan405.html | third-party-advisory | |
| https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/rabidhamster_r4_log.rb | exploit | |
| https://www.exploit-db.com/exploits/18929 | exploit | |
| https://www.rabidhamster.org/R4/download.php | product | |
| https://www.vulncheck.com/advisories/rabidhamster-r4-log-entry-buffer-overflow | third-party-advisory |
Change history (0)
No recorded changes yet.