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Fencer Intel
medium 6.1

CVE-2012-4999 json

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 s…

published 2012-09-19 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-4923

cvss
6.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
6.6%
EPSS 6.6% chance of exploitation in 30 days, percentile 93%
public exploits
1
Exploit-DB

Summary

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.

Timeline

  1. First public exploit (EDB-36868)
  2. Published

Exploit prediction

6.56% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-36868 Mercury MR804 Router - Multiple HTTP Header Fields Denial of Service Vulnerabilities dos, 2012-02-21
  • archives.neohapsis.com http://archives.neohapsis.com/archives/bugtraq/2012-02/0116.html referenced PoC, tagged "exploit" by a source, unverified
  • securityfocus.com http://www.securityfocus.com/bid/52106 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.1 AV:A/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

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.