Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2012-0477

19
FAUCET Score

CVE-2012-0477 describes multiple cross-site scripting (XSS) vulnerabilities affecting Mozilla Firefox (versions 4.x-11.0, ESR 10.x before 10.0.4), Thunderbird (versions 5.0-11.0, ESR 10.x before 10.0.4), and SeaMonkey (before 2.9). These vulnerabilities allow remote attackers to inject arbitrary web script or HTML through the ISO-2022-KR or ISO-2022-CN character sets. With a CVSS score of 4.3, this vulnerability has a network attack vector and medium attack complexity, potentially leading to information integrity compromise. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion, and it is not listed in CISA's KEV catalog.

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

4.3MEDIUM

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

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.05%
Probability of exploitation in next 30 days
EPSS Percentile
79.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0205 is in the 65th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:10.0.4-1.el5_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:10.0.4-1.el5_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:10.0.4-1.el5_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: thunderbird-0:10.0.4-1.el6_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: firefox-0:10.0.4-1.el6_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: xulrunner-0:10.0.4-1.el6_2
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2012-0477Moderate

Mozilla: Potential XSS through ISO-2022-KR/ISO-2022-CN decoding issues (MFSA 2012-29)

Apr 24, 2012

References

bugzilla.mozilla.org / show_bug.cgi
secunia.com / advisories/48920
secunia.com / advisories/48922
secunia.com / advisories/48972
secunia.com / advisories/49047
secunia.com / advisories/49055
exchange.xforce.ibmcloud.com / vulnerabilities/75154
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16889
debian.org / security/2012/dsa-2457
debian.org / security/2012/dsa-2458
debian.org / security/2012/dsa-2464
mandriva.com / security/advisories
mandriva.com / security/advisories
mozilla.org / security/announce/2012/mfsa2012-29.html
Vendor Advisory
securityfocus.com / bid/53229