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CVE-2006-4253

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause...

7.6 HighPublic exploitFix available

CVE-2006-4253 is a high vulnerability (CVSS 7.6) in K-meleon Project K-meleon, published August 21, 2006. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 15.2%, the 96th percentile. Fixed in thunderbird 1.5.0.7-1.

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Exploit likelihood

15.2%Down 30.7 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.6

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Record
CVE-2006-4253
CVSS 2.0
7.6 HighAV:N/AC:H/Au:N/C:C/I:C/A:C
Weakness
CWE-264
Updated
2026-11-02
CVE List No score

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Record
CVE-2006-4253
Updated
2026-11-02
EUVDEUVD-2006-4241 No score

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Record
EUVD-2006-4241
Updated
2026-11-03
GitHub AdvisoriesGHSA-42hr-qcx2-4fr6 No score

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause...

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Record
GHSA-42hr-qcx2-4fr6
Updated
2026-11-02
OSV No score

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Record
CVE-2006-4253
Updated
2026-11-02
OSVDEBIAN-CVE-2006-4253 No score

Concurrency vulnerability in Mozilla Firefox 1.5.0.6 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via multiple Javascript timed events that load a deeply nested XML file, followed by redirecting the browser to another page, which leads to a concurrency failure that causes structures to be freed incorrectly, as demonstrated by (1) ffoxdie and (2) ffoxdie3. NOTE: it has been reported that Netscape 8.1 and K-Meleon 1.0.1 are also affected by ffoxdie. Mozilla confirmed to CVE that ffoxdie and ffoxdie3 trigger the same underlying vulnerability. NOTE: it was later reported that Firefox 2.0 RC2 and 1.5.0.7 are also affected.

Record
DEBIAN-CVE-2006-4253
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
thunderbird
Debian:12
before 1.5.0.7-1
1.5.0.7-1
thunderbird
Debian:13
before 1.5.0.7-1
1.5.0.7-1
thunderbird
Debian:14
before 1.5.0.7-1
1.5.0.7-1
firefox
Red Hat:enterprise_linux:4::as
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::as
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
firefox
Red Hat:enterprise_linux:4::desktop
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::desktop
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
firefox
Red Hat:enterprise_linux:4::es
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
firefox-debuginfo
Red Hat:enterprise_linux:4::es
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
firefox
Red Hat:enterprise_linux:4::ws
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
Show 93 moreShow less
Affected packages
PackageAffectedFixed
firefox-debuginfo
Red Hat:enterprise_linux:4::ws
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
seamonkey
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-chat
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-debuginfo
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-devel
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-dom-inspector
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-js-debugger
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-mail
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr-devel
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss-devel
Red Hat:enterprise_linux:3::as
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-chat
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-debuginfo
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-devel
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-dom-inspector
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-js-debugger
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-mail
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr-devel
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss-devel
Red Hat:enterprise_linux:3::desktop
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-chat
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-debuginfo
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-devel
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-dom-inspector
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-js-debugger
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-mail
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr-devel
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss-devel
Red Hat:enterprise_linux:3::es
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-chat
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-debuginfo
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-devel
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-dom-inspector
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-js-debugger
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-mail
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nspr-devel
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
seamonkey-nss-devel
Red Hat:enterprise_linux:3::ws
before 0:1.0.5-0.1.el3
0:1.0.5-0.1.el3
devhelp
Red Hat:enterprise_linux:4::as
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-debuginfo
Red Hat:enterprise_linux:4::as
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-devel
Red Hat:enterprise_linux:4::as
before 0:0.10-0.4.el4
0:0.10-0.4.el4
seamonkey
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-chat
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-debuginfo
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-devel
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-dom-inspector
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-js-debugger
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-mail
Red Hat:enterprise_linux:4::as
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
devhelp
Red Hat:enterprise_linux:4::desktop
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-debuginfo
Red Hat:enterprise_linux:4::desktop
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-devel
Red Hat:enterprise_linux:4::desktop
before 0:0.10-0.4.el4
0:0.10-0.4.el4
seamonkey
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-chat
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-debuginfo
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-devel
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-dom-inspector
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-js-debugger
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-mail
Red Hat:enterprise_linux:4::desktop
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
devhelp
Red Hat:enterprise_linux:4::es
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-debuginfo
Red Hat:enterprise_linux:4::es
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-devel
Red Hat:enterprise_linux:4::es
before 0:0.10-0.4.el4
0:0.10-0.4.el4
seamonkey
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-chat
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-debuginfo
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-devel
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-dom-inspector
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-js-debugger
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-mail
Red Hat:enterprise_linux:4::es
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
devhelp
Red Hat:enterprise_linux:4::ws
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-debuginfo
Red Hat:enterprise_linux:4::ws
before 0:0.10-0.4.el4
0:0.10-0.4.el4
devhelp-devel
Red Hat:enterprise_linux:4::ws
before 0:0.10-0.4.el4
0:0.10-0.4.el4
seamonkey
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-chat
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-debuginfo
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-devel
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-dom-inspector
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-js-debugger
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
seamonkey-mail
Red Hat:enterprise_linux:4::ws
before 0:1.0.5-0.1.el4
0:1.0.5-0.1.el4
thunderbird
Red Hat:enterprise_linux:4::as
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird-debuginfo
Red Hat:enterprise_linux:4::as
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird
Red Hat:enterprise_linux:4::desktop
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird-debuginfo
Red Hat:enterprise_linux:4::desktop
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird
Red Hat:enterprise_linux:4::es
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird-debuginfo
Red Hat:enterprise_linux:4::es
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird
Red Hat:enterprise_linux:4::ws
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4
thunderbird-debuginfo
Red Hat:enterprise_linux:4::ws
before 0:1.5.0.7-0.1.el4
0:1.5.0.7-0.1.el4

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBMozilla Firefox 1.0.x - JavaScript Handler Race Condition Memory Corruption2006-08-12

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

References

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