The js_dtoa function in Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, and SeaMonkey before 1.0.7 overwrites memory instead of exiting when the floating point precision is reduced, which allows remote attackers to cause a denial of service via any plugins that reduce the precision.
CVE-2006-6499
MEDIUMCVSS v2 · 4.34.3—
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 4.3 — v2 rates that MEDIUM (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:N/AC:M/Au:N/C:N/I:N/A:P. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 3.9% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.
Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
4.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3.9%CVSS v2: 4.3Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 4.3MEDIUMNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 4.3MEDIUMlow confidence
- EG Risk
- 25EG Risk 25/100
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computed (value × EchelonGraph’s weight)Severity43% × 45%The EG Score, 4.3 of 10.Exploitation4% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability30% × 15%EchelonGraph's default before algorithm v3.4: CISA had not published Automatable for this CVE.SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 3.9%
- EPSS %ILE
- 90th
- KEV
- Not listed
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track or Track* or Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
Published
December 20, 2006
Last Modified
April 23, 2026
References (34)
- secalert@redhat · CVE Programhttp://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00771742Broken Link
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23282Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23420Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23422Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23545Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23589Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23591Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23614Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23672Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23692Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/23988Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/24078Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://secunia.com/advisories/24390Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://security.gentoo.org/glsa/glsa-200701-02.xmlBroken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://securitytracker.com/id?1017398Broken Link · Third Party Advisory · VDB Entry
15 of 34 shown · show the other 19
- secalert@redhat · CVE Programhttp://securitytracker.com/id?1017405Broken Link · Third Party Advisory · VDB Entry
- secalert@redhat · CVE Programhttp://securitytracker.com/id?1017406Broken Link · Third Party Advisory · VDB Entry
- secalert@redhat · CVE Programhttp://sunsolve.sun.com/search/document.do?assetkey=1-26-102846-1Broken Link
- secalert@redhat · CVE Programhttp://www.debian.org/security/2007/dsa-1253Third Party Advisory
- secalert@redhat · CVE Programhttp://www.debian.org/security/2007/dsa-1258Third Party Advisory
- secalert@redhat · CVE Programhttp://www.debian.org/security/2007/dsa-1265Third Party Advisory
- secalert@redhat · CVE Programhttp://www.gentoo.org/security/en/glsa/glsa-200701-04.xmlThird Party Advisory
- secalert@redhat · CVE Programhttp://www.kb.cert.org/vuls/id/427972Third Party Advisory · US Government Resource
- secalert@redhat · CVE Programhttp://www.mozilla.org/security/announce/2006/mfsa2006-68.htmlVendor Advisory
- secalert@redhat · CVE Programhttp://www.novell.com/linux/security/advisories/2006_80_mozilla.htmlBroken Link
- secalert@redhat · CVE Programhttp://www.novell.com/linux/security/advisories/2007_06_mozilla.htmlBroken Link
- secalert@redhat · CVE Programhttp://www.securityfocus.com/bid/21668Broken Link · Third Party Advisory · VDB Entry
- secalert@redhat · CVE Programhttp://www.ubuntu.com/usn/usn-398-1Third Party Advisory
- secalert@redhat · CVE Programhttp://www.ubuntu.com/usn/usn-398-2Third Party Advisory
- secalert@redhat · CVE Programhttp://www.ubuntu.com/usn/usn-400-1Third Party Advisory
- secalert@redhat · CVE Programhttp://www.us-cert.gov/cas/techalerts/TA06-354A.htmlBroken Link · Third Party Advisory · US Government Resource
- secalert@redhat · CVE Programhttp://www.vupen.com/english/advisories/2006/5068Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://www.vupen.com/english/advisories/2007/1124Broken Link · Third Party Advisory
- secalert@redhat · CVE Programhttp://www.vupen.com/english/advisories/2008/0083Broken Link · Third Party Advisory
Patch Availability(3)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | mozilla-thunderbird-dev (1.5.0.9-0ubuntu0.6.10) @ edgy | 2026-05-31 | ubuntu |
| ubuntu | libnspr4 (1.5.dfsg+1.5.0.9-0ubuntu0.6.06) @ dapper | 2026-05-31 | ubuntu |
| ubuntu | libnspr4 (2.0.0.1+0dfsg-0ubuntu0.6.10) @ edgy | 2026-05-31 | ubuntu |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(7 across 5 ecosystems)
Debian:3.1(3)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| mozilla | 2:1.7.8-1 ... 2:1.7.8-1sarge9 (13 versions) |
| — |
| mozilla-firefox | 1.0.4-2 ... 1.0.4-2sarge9 (14 versions) |
| — |
| mozilla-thunderbird | 1.0.2-2 ... 1.0.2-2.sarge1.0.8e.1 (10 versions) |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | — |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| firefox-esr | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(3)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 9× in last 7d / 16× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 78 of 102 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 22 repeat rows among the latest 100 are merged into the row they repeat. The 24 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-11 13:37 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-10 19:53 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-09 19:59 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-08 16:32 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-07 23:36 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-06 15:08 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-05 17:37 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-10-05 00:44 UTCOSV refresh
- 2026-10-04 23:15 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-09-30 14:57 UTCEPSS rescoreEPSS 3.9% · 90th percentile
- 2026-09-29 07:36 UTCEG score recompute
- 2026-09-18 19:20 UTCEPSS rescoreEPSS 3.9% · 89th percentile
- 2026-09-15 09:24 UTCOSV refresh
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-09-13 16:40 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-09-12 14:54 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-09-10 09:24 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-09-04 13:54 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-09-04 04:59 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-30 01:14 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-27 08:34 UTCOSV refresh
- 2026-08-10 22:08 UTCOSV refresh
- 2026-08-08 16:30 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-07 16:20 UTCEPSS rescoreEPSS 3.8% · 89th percentile
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- 2026-08-06 13:41 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-05 19:11 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-04 15:03 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-04 10:28 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-08-03 10:28 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-07-28 15:30 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-07-26 13:30 UTCEG score recompute▲ 4.30
- 2026-07-25 22:31 UTCOSV refresh
- 2026-07-25 14:11 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-07-24 14:11 UTCEPSS rescoreEPSS 3.8% · 88th percentile
- 2026-07-23 00:52 UTCEG score recompute
- 2026-07-23 00:31 UTCEG score recompute
- 2026-07-22 23:56 UTCEG score recompute
- 2026-07-22 21:36 UTCEG score recompute
- 2026-07-22 14:03 UTCEPSS rescoreEPSS 3.8% · 89th percentile
- 2026-07-21 15:19 UTCEPSS rescoreEPSS 3.8% · 88th percentile
- 2026-07-20 17:02 UTCEPSS rescoreEPSS 3.8% · 88th percentile
- 2026-07-16 16:58 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-15 01:55 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-13 22:25 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-13 06:07 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-08 17:09 UTCOSV refresh
- 2026-07-08 15:09 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-06 02:19 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-05 02:26 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-04 06:26 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-02 14:00 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-07-01 15:02 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-30 23:18 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-29 14:02 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-28 14:02 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-28 04:52 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-25 13:46 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-24 14:01 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-23 21:29 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-21 01:56 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-20 05:12 UTCOSV refresh
- 2026-06-19 19:22 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-18 17:49 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-17 17:49 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-16 17:49 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-15 17:44 UTCEPSS rescoreEPSS 3.7% · 88th percentile
- 2026-06-14 23:13 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-13 22:57 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-12 23:08 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-07 15:21 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-06 13:44 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-05 22:44 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-04 13:09 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-02 20:10 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-06-01 13:49 UTCEPSS rescoreEPSS 14% · 94th percentile
- 2026-05-31 22:28 UTCEPSS rescoreEPSS 14% · 94th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:3.1:mozilla-thunderbird
- CVE-2006-4571EG 10.0EPSS p93HIGH
- CVE-2006-4565EG 9.3EPSS p93HIGH
- CVE-2006-2787EG 9.3HIGH
- CVE-2006-2779EG 9.3EPSS p94HIGH
- CVE-2006-2780EG 9.3EPSS p94HIGH
- CVE-2006-1737EG 9.3EPSS p92HIGH
- CVE-2006-0748EG 9.3EPSS p95HIGH
- CVE-2006-0749EG 9.3EPSS p96HIGH
- CVE-2006-1728EG 9.3EPSS p95HIGH
- CVE-2006-1730EG 9.3EPSS p96HIGH
Same vendor
9 shownubuntu:USN-398-1 · ubuntu:USN-400-1
Same CWE
10 shownCWE-835
Frequently asked(4)
What is CVE-2006-6499?
CVE-2006-6499 is a medium-severity vulnerability; its CVE record was published on December 20, 2006. The js_dtoa function in Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, and SeaMonkey before 1.0.7 overwrites memory instead of exiting when the floating point precision is reduced, which allows remote attackers to cause a denial of service via any plugins that…
When was the CVE record for CVE-2006-6499 published?
The CVE record for CVE-2006-6499 was published on December 20, 2006. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 23, 2026; the record at its source may have been updated since.
Is CVE-2006-6499 actively exploited?
CVE-2006-6499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.9% probability of exploitation in the next 30 days (90th percentile of EPSS-scored CVEs).
How do I remediate CVE-2006-6499?
A fix for CVE-2006-6499 is available: update to the fixed version the vendor names in its advisory.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2006-6499
Is Your Infrastructure Affected by CVE-2006-6499?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.