nsIRDFService in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 allows remote attackers to bypass the same-origin policy and read XML data from another domain via a cross-domain redirect.
CVE-2009-0776
HIGHCVSS v2 · 7.17.1—
EchelonGraph scoreLOW confidence
This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.1 — v2 rates that HIGH (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:C/I:N/A:N. 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 1.6% 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
7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS v2: 7.1Exploit: None knownExposed services: Not assessed
A fix is available — apply it.
- CVSS v2.0 (legacy)
- 7.1HIGHNVD never assigned a CVSS v3 rating to this CVE
- EG Score
- 7.1HIGHlow confidence
- EG Risk
- 37EG Risk 37/100
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)Severity71% × 45%The EG Score, 7.1 of 10.Exploitation2% × 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
- 1.6%
- EPSS %ILE
- 75th
- 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
March 5, 2009
Last Modified
April 23, 2026
References (38)
- secalert@redhat · CVE Programhttp://lists.opensuse.org/opensuse-security-announce/2009-03/msg00002.html
- secalert@redhat · CVE Programhttp://lists.opensuse.org/opensuse-security-announce/2009-04/msg00009.html
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34137
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34140
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34145
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34272
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34324
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34383
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34387
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34417
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34462
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34464
- secalert@redhat · CVE Programhttp://secunia.com/advisories/34527
- secalert@redhat · CVE Programhttp://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.405420
- secalert@redhat · CVE Programhttp://slackware.com/security/viewer.php?l=slackware-security&y=2009&m=slackware-security.433952
15 of 38 shown · show the other 23
- secalert@redhat · CVE Programhttp://support.avaya.com/elmodocs2/security/ASA-2009-069.htm
- secalert@redhat · CVE Programhttp://support.avaya.com/japple/css/japple?temp.documentID=366362&temp.productID=154235&temp.releaseID=361845&temp.bucketID=126655&PAGE=Document
- secalert@redhat · CVE Programhttp://www.debian.org/security/2009/dsa-1751
- secalert@redhat · CVE Programhttp://www.debian.org/security/2009/dsa-1830
- secalert@redhat · CVE Programhttp://www.mandriva.com/security/advisories?name=MDVSA-2009:075
- secalert@redhat · CVE Programhttp://www.mandriva.com/security/advisories?name=MDVSA-2009:083
- secalert@redhat · CVE Programhttp://www.mozilla.org/security/announce/2009/mfsa2009-09.htmlVendor Advisory
- secalert@redhat · CVE Programhttp://www.redhat.com/support/errata/RHSA-2009-0258.html
- secalert@redhat · CVE Programhttp://www.redhat.com/support/errata/RHSA-2009-0315.html
- secalert@redhat · CVE Programhttp://www.redhat.com/support/errata/RHSA-2009-0325.html
- secalert@redhat · CVE Programhttp://www.securityfocus.com/bid/33990
- secalert@redhat · CVE Programhttp://www.securitytracker.com/id?1021797
- secalert@redhat · CVE Programhttp://www.vupen.com/english/advisories/2009/0632
- secalert@redhat · CVE Programhttps://bugzilla.mozilla.org/show_bug.cgi?id=414540
- secalert@redhat · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5956
- secalert@redhat · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6017
- secalert@redhat · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6191
- secalert@redhat · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7390
- secalert@redhat · CVE Programhttps://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9241
- secalert@redhat · CVE Programhttps://usn.ubuntu.com/741-1/
- secalert@redhat · CVE Programhttps://www.redhat.com/archives/fedora-package-announce/2009-March/msg00769.html
- secalert@redhat · CVE Programhttps://www.redhat.com/archives/fedora-package-announce/2009-March/msg00771.html
- secalert@redhat · CVE Programhttps://www.redhat.com/archives/fedora-package-announce/2009-March/msg01077.html
Patch Availability(7)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | firefox (1.5.dfsg+1.5.0.15~prepatch080614k-0ubuntu1) @ dapper | 2026-05-30 | ubuntu |
| ubuntu | thunderbird (2.0.0.21+nobinonly-0ubuntu0.8.10.1) @ intrepid | 2026-05-30 | ubuntu |
| ubuntu | firefox (2.0.0.21~tb.21+nobinonly-0ubuntu0.7.10.1) @ gutsy | 2026-05-30 | ubuntu |
| ubuntu | xulrunner-1.9 (1.9.0.7+nobinonly-0ubuntu0.8.10.1) @ intrepid | 2026-05-30 | ubuntu |
| redhat | thunderbird-0:2.0.0.21-1.el5 | 2009-03-24 | redhat |
| redhat | seamonkey-0:1.0.9-38.el4 | 2009-03-05 | redhat |
| redhat | xulrunner-0:1.9.0.7-1.el5 | 2009-03-05 | redhat |
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
(2 across 1 ecosystem)
Debian:5.0(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| icedove | 2.0.0.19-1, 2.0.0.19-1+kbsd |
| — |
| xulrunner | 1.9.0.5-1, 1.9.0.6-1 |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(7)
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.
- Red HatRHSA-2009:0258MODERATE2009-03-04
RHSA-2009:0258 — Moderate
- Red HatRHSA-2009:0315MODERATE2009-03-04
RHSA-2009:0315 — Moderate
- Red HatRHSA-2009:0325MODERATE2009-03-04
RHSA-2009:0325 — Moderate
- UbuntuUSN-728-1LOW
Firefox and Xulrunner vulnerabilities
- UbuntuUSN-728-2LOW
Firefox vulnerabilities
- UbuntuUSN-728-3LOW
Firefox vulnerabilities
- UbuntuUSN-741-1LOW
Thunderbird vulnerabilities
Data Freshness Timeline
(refreshed 7× 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 80 of 111 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. 20 repeat rows among the latest 100 are merged into the row they repeat. The 31 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-11 13:38 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-10-10 19:54 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-10-09 20:00 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-10-08 16:33 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-10-07 23:37 UTCEPSS rescoreEPSS 1.6% · 75th percentile
- 2026-10-06 15:09 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-10-05 17:37 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-30 14:58 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-29 07:57 UTCEG score recompute
- 2026-09-27 13:39 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-26 15:52 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-24 13:57 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-17 19:20 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-13 16:40 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-12 14:54 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-10 09:24 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-06 13:41 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-09-04 13:55 UTCEPSS rescoreEPSS 1.6% · 74th percentile
- 2026-08-28 21:34 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-27 14:19 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-25 13:43 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-19 16:58 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-15 01:24 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
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- 2026-08-09 13:41 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-08 16:31 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-06 13:41 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-08-03 10:28 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-30 16:22 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-30 01:26 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-26 13:37 UTCEG score recompute▲ 7.10
- 2026-07-25 14:12 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-24 14:12 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-23 14:14 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-23 00:58 UTCEG score recompute
- 2026-07-23 00:36 UTCEG score recompute
- 2026-07-23 00:03 UTCEG score recompute
- 2026-07-22 21:42 UTCEG score recompute
- 2026-07-22 14:03 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-21 15:20 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-20 17:03 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-18 09:59 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-16 16:58 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 1.6% · 73rd percentile
- 2026-07-15 01:55 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-13 22:25 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-13 06:07 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-11 08:22 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-09 19:04 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-08 15:10 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-06 16:23 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-06 02:19 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-05 02:26 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-04 06:27 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-07-01 15:02 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-30 23:19 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-29 14:02 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-28 14:03 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-28 04:52 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-27 03:05 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-25 13:46 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-24 14:02 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-23 21:29 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-21 14:53 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-19 19:22 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-18 17:49 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-17 17:49 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-16 17:49 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-15 17:44 UTCEPSS rescoreEPSS 1.6% · 72nd percentile
- 2026-06-14 23:14 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-13 22:57 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-12 23:08 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-10 22:14 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-10 13:17 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-08 14:13 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-07 15:22 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-06 13:44 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-05 22:44 UTCEPSS rescoreEPSS 0.9% · 75th percentile
- 2026-06-05 06:07 UTCEPSS rescoreEPSS 0.9% · 75th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:5.0:icedove
- CVE-2009-3075EG 10.0EPSS p92HIGH
- CVE-2009-3072EG 10.0EPSS p92HIGH
- CVE-2009-0773EG 10.0EPSS p93HIGH
- CVE-2009-0771EG 10.0EPSS p91HIGH
- CVE-2009-2061EG 9.3HIGH
- CVE-2009-1841EG 9.3EPSS p92HIGH
- CVE-2009-1838EG 9.3EPSS p92HIGH
- CVE-2009-1832EG 9.3EPSS p95HIGH
- CVE-2009-1392EG 9.3EPSS p95HIGH
- CVE-2009-0774EG 9.3EPSS p90HIGH
Same vendor
10 shownredhat:RHSA-2009:0258 · redhat:RHSA-2009:0315
- CVE-2009-0774EG 9.3EPSS p90HIGH
- CVE-2009-0772EG 9.3EPSS p90HIGH
- CVE-2009-0775EG 10.0EPSS p92HIGH
- CVE-2009-0040EG 6.8EPSS p92MEDIUM
- CVE-2009-0773EG 10.0EPSS p93HIGH
- CVE-2009-0771EG 10.0EPSS p91HIGH
- CVE-2009-0352EG 10.0EPSS p91HIGH
- CVE-2009-0777EG 5.8MEDIUM
- CVE-2009-0353EG 10.0EPSS p91HIGH
- CVE-2009-0355EG 5.4MEDIUM
Frequently asked(4)
What is CVE-2009-0776?
CVE-2009-0776 is a high-severity vulnerability; its CVE record was published on March 5, 2009. nsIRDFService in Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 allows remote attackers to bypass the same-origin policy and read XML data from another domain via a cross-domain redirect.
When was CVE-2009-0776 made public?
CVE-2009-0776 was made public on March 4, 2009: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on March 5, 2009. 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-2009-0776 actively exploited?
CVE-2009-0776 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (75th percentile of EPSS-scored CVEs).
How do I remediate CVE-2009-0776?
A fix for CVE-2009-0776 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-2009-0776
Is Your Infrastructure Affected by CVE-2009-0776?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.