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CVE-2008-5014

28
FAUCET Score

CVE-2008-5014 is a critical denial-of-service and potential arbitrary code execution vulnerability affecting Mozilla Firefox, Thunderbird, and SeaMonkey versions prior to their respective patches. It allows remote attackers to crash the application by manipulating the window.__proto__.__proto__ object, leading to an assertion failure. With a CVSS score of 10.0, this vulnerability is easily exploitable over the network without authentication, posing a severe risk of complete compromise. Despite its high severity and EPSS score, there is no known active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0, < 2.0.0.18CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
>= 3.0, < 3.0.2CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
>= 1.0, < 1.1.13CPE matchmatch criteria
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
>= 2.0, < 2.0.0.18CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
5.87%
Probability of exploitation in next 30 days
EPSS Percentile
92.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0587 is in the 87th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (13)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: yelp-0:2.16.0-22.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 2.1Fixed in: seamonkey-0:1.0.9-0.21.el2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 3Fixed in: seamonkey-0:1.0.9-0.25.el3
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: thunderbird-0:1.5.0.12-17.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: seamonkey-0:1.0.9-28.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: firefox-0:3.0.4-1.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: nss-0:3.12.1.1-3.el4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: thunderbird-0:2.0.0.18-1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: devhelp-0:0.12-20.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: firefox-0:3.0.4-1.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss-0:3.12.1.1-3.el5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: xulrunner-0:1.9.0.4-1.el5
View patch
mozillavendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2008-5014Critical

Mozilla crash and remote code execution via __proto__ tampering

Nov 12, 2008

References

lists.opensuse.org / opensuse-security-announce/2008-11/msg00004.html
Third Party Advisory
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVendor Advisory
secunia.com / advisories/32011
Third Party Advisory
secunia.com / advisories/32684
Third Party Advisory
secunia.com / advisories/32693
Third Party Advisory
secunia.com / advisories/32694
Third Party Advisory
secunia.com / advisories/32695
Third Party Advisory
secunia.com / advisories/32714
Third Party Advisory
secunia.com / advisories/32715
Third Party Advisory
secunia.com / advisories/32721
Third Party Advisory
secunia.com / advisories/32778
Third Party Advisory
secunia.com / advisories/32798
Third Party Advisory
secunia.com / advisories/32845
Third Party Advisory
secunia.com / advisories/32853
Third Party Advisory
secunia.com / advisories/33433
Third Party Advisory
secunia.com / advisories/33434
Third Party Advisory
secunia.com / advisories/34501
Third Party Advisory
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9157
Third Party Advisory
sunsolve.sun.com / search/document.do
Broken Link
redhat.com / archives/fedora-package-announce/2008-November/msg00366.html
Third Party Advisory
redhat.com / archives/fedora-package-announce/2008-November/msg00385.html
Third Party Advisory
ubuntu.com / usn/usn-667-1
Third Party Advisory
debian.org / security/2008/dsa-1669
Third Party Advisory
debian.org / security/2008/dsa-1671
Third Party Advisory
debian.org / security/2009/dsa-1696
Third Party Advisory
debian.org / security/2009/dsa-1697
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
mandriva.com / security/advisories
Third Party Advisory
mozilla.org / security/announce/2008/mfsa2008-50.html
Vendor Advisory
redhat.com / support/errata/RHSA-2008-0976.html
Third Party Advisory
redhat.com / support/errata/RHSA-2008-0977.html
Third Party Advisory
redhat.com / support/errata/RHSA-2008-0978.html
Third Party Advisory
securityfocus.com / bid/32281
Third Party AdvisoryVDB Entry
securitytracker.com / id
Third Party AdvisoryVDB Entry
us-cert.gov / cas/techalerts/TA08-319A.html
Third Party AdvisoryUS Government Resource
vupen.com / english/advisories/2008/3146
Third Party Advisory
vupen.com / english/advisories/2009/0977
Third Party Advisory