RabidHamster R4 Log Entry sprintf() Buffer Overflow

published 2025-08-13 14 mo ago modified 2026-06-16 4 mo ago also EUVD-2012-6602

cvss: 10.0; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.2%; EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits: 1; Metasploit

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.

Timeline

2012-02-09 First public exploit (Metasploit exploit/windows/http/rabidhamster_r4_log)
2025-08-13 Published

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: 14 mo ago (2025-08-14)

Exploit prediction

2.20% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

Metasploit exploit/windows/http/rabidhamster_r4_log RabidHamster R4 Log Entry sprintf() Buffer Overflow metasploit exploit, normal rank, 2012-02-09
raw.githubusercontent.com https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/rabidhamster_r4_log.rb referenced PoC, tagged "exploit" by a source, unverified
exploit-db.com https://www.exploit-db.com/exploits/18929 referenced PoC, tagged "exploit" by a source, unverified
aluigi.altervista.org http://aluigi.altervista.org/adv/r4_1-adv.txt referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	10.0	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
CNA	4.0	10.0	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

Affected products

RabidHamster R4 Embedded Server

Classification

Weakness

CWE-121 Stack-based Buffer Overflow

References

raw.githubusercontent.com /rapid7/metasploit-framework/master/modules/exploits/windows/http/rabidhamster_r4_log.rb
exploit
exploit-db.com /exploits/18929
exploit
aluigi.altervista.org /adv/r4_1-adv.txt
technical-description, exploit
advisories.checkpoint.com /defense/advisories/public/2013/cpai-07-jan405.html
third-party-advisory
rabidhamster.org /R4/download.php
product
vulncheck.com /advisories/rabidhamster-r4-log-entry-buffer-overflow
third-party-advisory

Sources

CVE List CVE-2012-10058
NVD CVE-2012-10058

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary