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CVE-2012-0475

15
FAUCET Score

CVE-2012-0475 describes a vulnerability in Mozilla Firefox, Thunderbird, and SeaMonkey versions that could allow remote attackers to bypass IPv6 literal Access Control Lists (ACLs). This bypass is achieved through malformed Origin and Sec-WebSocket-Origin HTTP headers during XMLHttpRequest or WebSocket operations involving nonstandard port numbers and specific IPv6 addresses. The vulnerability has a low CVSS score of 2.6, indicating a network-based attack with high complexity and a potential impact of partial integrity compromise. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
4.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:4.0:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:4.0:beta1:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:4.0:beta10:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:4.0:beta11:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:4.0:beta12:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

2.6LOW

AV:N/AC:H/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.87%
Probability of exploitation in next 30 days
EPSS Percentile
77.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0187 is in the 69th percentile among its peer group of 1,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2012-0475

Multiple flaws in Firefox 12 which do not affect firefox 10.0.4 ESR

Apr 24, 2012

References

bugzilla.mozilla.org / show_bug.cgi
secunia.com / advisories/48972
secunia.com / advisories/49047
secunia.com / advisories/49055
exchange.xforce.ibmcloud.com / vulnerabilities/75153
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16279
mozilla.org / security/announce/2012/mfsa2012-28.html
Vendor Advisory
securityfocus.com / bid/53230