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Fencer Intel
medium 4.0

CVE-2013-0776 json

Mozilla Firefox before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before 17.0.3, Thunderbird ESR 17.x before 17.0.3, and SeaMonkey b…

published 2013-02-19 13 y ago modified 2026-06-16 4 mo ago also EUVD-2013-0787

cvss
4.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

Mozilla Firefox before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before 17.0.3, Thunderbird ESR 17.x before 17.0.3, and SeaMonkey before 2.16 allow man-in-the-middle attackers to spoof the address bar by operating a proxy server that provides a 407 HTTP status code accompanied by web script, as demonstrated by a phishing attack on an HTTPS site.

Patch / fix

  • mozilla firefox 17.0.3, 19.0
  • mozilla seamonkey 2.16
  • mozilla thunderbird 17.0.3
  • mozilla thunderbird_esr 17.0.3
  • thunderbird RHEL 5 PRODUCTIVITY 17.0.3-1.el5_9
  • thunderbird RHEL 6 17.0.3-1.el6_3
  • firefox RHEL 5 17.0.3-1.el5_9
  • firefox RHEL 6 17.0.3-1.el6_3
  • yelp RHEL 5 2.16.0-30.el5_9
  • yelp RHEL 6 2.28.1-17.el6_3
  • devhelp RHEL 5 0.12-23.el5_9
  • libproxy RHEL 6 0.3.0-4.el6_3

red hat advisories RHSA-2013:0272RHSA-2013:0271

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 50.1.0-1.1
  • MozillaThunderbird openSUSE Tumbleweed 45.5.1-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10071-1openSUSE-SU-2024:10230-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-0776 updated cvss 4.3

Mozilla: Phishing on HTTPS connection through malicious proxy (MFSA 2013-27)

  • Red Hat Enterprise Linux 5 thunderbird
    affected: no fix available
  • Red Hat Enterprise Linux (v. 5 server) yelp 2.16.0-30.el5_9, devhelp 0.12-23.el5_9, firefox 17.0.3-1.el5_9, xulrunner 17.0.3-1.el5_9 Red Hat Enterprise Linux Desktop (v. 6) yelp 2.28.1-17.el6_3, firefox 17.0.3-1.el6_3, libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-bin 0.3.0-4.el6_3, thunderbird 17.0.3-1.el6_3, +1 more Red Hat Enterprise Linux Desktop Optional (v. 6) libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-kde 0.3.0-4.el6_3, libproxy-gnome 0.3.0-4.el6_3, libproxy-mozjs 0.3.0-4.el6_3, libproxy-webkit 0.3.0-4.el6_3 Red Hat Enterprise Linux HPC Node Optional (v. 6) yelp 2.28.1-17.el6_3, firefox 17.0.3-1.el6_3, libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-bin 0.3.0-4.el6_3, libproxy-kde 0.3.0-4.el6_3, +4 more Red Hat Enterprise Linux Server (v. 6) yelp 2.28.1-17.el6_3, firefox 17.0.3-1.el6_3, libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-bin 0.3.0-4.el6_3, libproxy-python 0.3.0-4.el6_3 Red Hat Enterprise Linux Server Optional (v. 6) libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-kde 0.3.0-4.el6_3, thunderbird 17.0.3-1.el6_3, libproxy-gnome 0.3.0-4.el6_3, libproxy-mozjs 0.3.0-4.el6_3, +1 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) yelp 2.28.1-17.el6_3, firefox 17.0.3-1.el6_3, libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-bin 0.3.0-4.el6_3, thunderbird 17.0.3-1.el6_3, +1 more Red Hat Enterprise Linux Workstation Optional (v. 6) libproxy 0.3.0-4.el6_3, xulrunner 17.0.3-1.el6_3, libproxy-kde 0.3.0-4.el6_3, libproxy-gnome 0.3.0-4.el6_3, libproxy-mozjs 0.3.0-4.el6_3, libproxy-webkit 0.3.0-4.el6_3
    fixed: vendor fix RHSA-2013:0271
  • Red Hat RHEL Optional Productivity Applications (v. 5 server) thunderbird 17.0.3-1.el5_9
    fixed: vendor fix RHSA-2013:0272

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.30% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.0 AV:N/AC:H/Au:N/C:P/I:P/A:N

Classification

Weakness
  • CWE-295 Improper Certificate 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.