peter bassill · operator
$ cve CVE-2009-1834 JSON

CVE-2009-1834 EXPLOIT

4.3
MEDIUM · CVSS 2.0 · EPSS 3.2% (pctl 88)

Patch early

A public exploit exists.

Description

Visual truncation vulnerability in netwerk/dns/src/nsIDNService.cpp in Mozilla Firefox before 3.0.11 and SeaMonkey before 1.1.17 allows remote attackers to spoof the location bar via an IDN with invalid Unicode characters that are displayed as whitespace, as demonstrated by the \u115A through \u115E characters.

Scoring

CVSS4.3 (MEDIUM, v2.0)
VectorAV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS3.23% — more likely to be exploited than 88% of all CVEs
WeaknessCWE-20
On CISA KEVno
Public exploityes
Published2009-06-12
Last modified2026-06-16

Affected (2)

VendorProduct
mozillafirefox
mozillaseamonkey

Public exploits

SourceTitleDate
exploit-dbMozilla Firefox 3.0.10 / SeaMonkey 1.1.16 - Address Bar URI Spoofing2009-05-11

References

→ the Explorer  ·  watch your stack  ·  NVD