Is CVE-2012-4999 being actively exploited?

CVE-2012-4999 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2012-4999?

CVE-2012-4999 has a CVSS 2.0 base score of 6.1 (MEDIUM).

CVE-2012-4999

MEDIUM · CVSS 6.1EPSS 6.6%EU EUVD

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.

Key facts

CVSS score: 6.1 (v2.0)
Severity: MEDIUM
CVSS vector: AV:A/AC:L/Au:N/C:N/I:N/A:C
Weakness (CWE): CWE-20
EPSS score: 6.6% (94th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2012-4923)
Published: September 19, 2012
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2012-4923 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

mercurycom / mr804
mercurycom / mr804 firmware

References

http://archives.neohapsis.com/archives/bugtraq/2012-02/0116.html(Exploit)
http://secunia.com/advisories/48079(Vendor Advisory)
http://www.securityfocus.com/bid/52106(Exploit)
https://exchange.xforce.ibmcloud.com/vulnerabilities/73383

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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