CVE-2012-4999

Mercury MR804 Router <8.0.3.8.1 Build - DoS

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2012-4999. PoCs published by demonalex.

AI-analyzed exploit summary This Perl script exploits a denial-of-service vulnerability in Mercury MR804 routers by sending an HTTP request with an oversized 'If-Unmodified-Since' header (4097 'A' characters), causing the device to crash.

Description

Mercury MR804 Router 8.0 3.8.1 Build 101220 Rel.53006nB allows remote attackers to cause a denial of service (service hang) via a crafted string in HTTP header fields such as (1) If-Modified-Since, (2) If-None-Match, or (3) If-Unmodified-Since. NOTE: some of these details are obtained from third party information.

Exploits (1)

exploitdb WORKING POC VERIFIED
by demonalex · perldoshardware
https://www.exploit-db.com/exploits/36868

This Perl script exploits a denial-of-service vulnerability in Mercury MR804 routers by sending an HTTP request with an oversized 'If-Unmodified-Since' header (4097 'A' characters), causing the device to crash.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Mercury MR804 router version 3.8.1 Build 101220
No auth needed
Prerequisites: Network access to the target device · Target device must be running vulnerable firmware
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (4)

Core 4
Core References
Vendor Advisory third-party-advisory x_refsource_secunia
http://secunia.com/advisories/48079
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/73383
Exploit mailing-list x_refsource_bugtraq
http://archives.neohapsis.com/archives/bugtraq/2012-02/0116.html
Exploit vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/52106

Scores

EPSS 0.0767
EPSS Percentile 92.1%

Details

CWE
CWE-20
Status published
Products (2)
mercurycom/mr804 8.0
mercurycom/mr804_firmware 3.8.1
Published Sep 19, 2012
Tracked Since Feb 18, 2026