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CVE-2009-0777
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed…
- 5.8MediumCVSS base score
- 1.5%Exploitation in 30 daysEPSS · top 26% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Mozilla Firefox before 3.0.7, Thunderbird before 2.0.0.21, and SeaMonkey before 1.1.15 decode invisible characters when they are displayed in the location bar, which causes an incorrect address to be displayed and makes it easier for remote attackers to spoof URLs and conduct phishing attacks.
Timeline
ID reserved
By redhat
- 2 days later
· 2 days later
Published
- 15 years later
· 15 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium5.8 | AV:N/AC:M/Au:N/C:N/I:P/A:P |
- EPSS (exploitation in 30 days)
- 1.5% · top 26% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.8.
Affected products
n/a
- affected n/a
References
19
- RHSA-2009:0315 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- http://www.mozilla.org/security/announce/2009/mfsa2009-11.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- SUSE-SA:2009:012 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- oval:org.mitre.oval:def:11222 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- oval:org.mitre.oval:def:6157 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- ADV-2009-0632 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- oval:org.mitre.oval:def:6039 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- oval:org.mitre.oval:def:6229 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- 34140 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 34272 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- 1021799 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 34145 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- http://support.avaya.com/elmodocs2/security/ASA-2009-069.htm (opens in a new tab)x_refsource_CONFIRMx_transferred
- mozilla-invisible-url-spoofing(49087) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- MDVSA-2009:075 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
- 33990 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=452979 (opens in a new tab)x_refsource_CONFIRMx_transferred
- http://support.avaya.com/japple/css/japple?temp.documentID=366362&temp.productID=154235&temp.releaseID=361845&temp.bucketID=126655&PAGE=Document (opens in a new tab)x_refsource_CONFIRMx_transferred
- oval:org.mitre.oval:def:7435 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2009-0777 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2009-0777)Record last updated .