CVE-2012-4999

Exp

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.

Published: 2012-09-19 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2012-4999 is rated High Exploit Risk (70.8/100): CVSS Medium severity, with high exploitation likelihood (EPSS 6.56%, 93th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2012-4999

EDB-ID Source Kind Published Link
36868 exploit_db edb 2012-02-21 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2012-4999

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 7.67% 6.56% -1.12%
2 2026-05-21 9.76% 7.67% -2.08%
3 2025-09-05 — 9.76% —

Full EPSS history (21 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2012-4999

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 2.0 MEDIUM
AV:A/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 6.5 6.9 [email protected]

Weakness enumeration for CVE-2012-4999

Affected software / configurations for CVE-2012-4999

Vendor Product Version Raw CPE
mercurycom mr804_firmware 3.8.1 cpe:2.3:o:mercurycom:mr804_firmware:3.8.1:*:*:*:*:*:*:*
mercurycom mr804 8.0 cpe:2.3:h:mercurycom:mr804:8.0:*:*:*:*:*:*:*

References for CVE-2012-4999

cvelogic Threat Intelligence