4.3

CVE-2009-1834: mozilla firefox Improper Input Validation

Modified
Published 12-06-2009Last modified 07-08-2024

Vulnerability summary

CVE-2009-1834 is a medium (CVSS 4.3) Improper Input Validation vulnerability in mozilla firefox. EPSS estimates a 3.23% chance of exploitation in the next 30 days, higher than 88.2% of scored vulnerabilities. 2 public exploits are recorded.

Priority
Prioritiseweaponized exploit

Weaponized exploit (exploit-database, 11-05-2009)

Source freshness unavailable

How is this decided?
CVSS score
4.3/10
010
Medium · v2.0 (NVD)
EPSS score
3.23%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits2reference, exploit-database

Advisory lineage

Upstream 0 · Downstream 2
DSA-1820-1RHSA-2009:1095

Timeline

  1. 12-06-2009
    PublishedVulnerability first disclosed.
  2. 07-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

1 score · 1 source · 1 version

EPSS trend

Probability

3.23%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

No change 0.00 pp

From 3.23% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

2 found
  • referenceUnverified

    Exploit Reference (bugzilla.mozilla.org)

    Maturity: unknown

  • exploit-databaseremotelinuxVerified

    Mozilla Firefox 3.0.10 / SeaMonkey 1.1.16 - Address Bar URI Spoofing

    Maturity: weaponized

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication (CVSS vector). Other conditions: not stated in public data.

Mozilla2 products
  • firefox≤ 3.0.10 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.6.1 | 0.7 | 0.7.1 | 0.8 | 0.9 | 0.9:rc | 0.9.1 | 0.9.2 | 0.9.3 | 0.9_rc | 0.10 | 0.10.1 | 1.0 | 1.0:preview_release | 1.0.1 | 1.0.2 | 1.0.3 | 1.0.4 | 1.0.5 | 1.0.6 | 1.0.7 | 1.0.8 | 1.4.1 | 1.5 | 1.5:beta1 | 1.5:beta2 | 1.5.0.1 | 1.5.0.2 | 1.5.0.3 | 1.5.0.4 | 1.5.0.5 | 1.5.0.6 | 1.5.0.7 | 1.5.0.8 | 1.5.0.9 | 1.5.0.10 | 1.5.0.11 | 1.5.0.12 | 1.5.1 | 1.5.2 | 1.5.3 | 1.5.4 | 1.5.5 | 1.5.6 | 1.5.7 | 1.5.8 | 1.8 | 2.0 | 2.0:beta_1 | 2.0:beta1 | 2.0:rc2 | 2.0:rc3 | 2.0.0.1 | 2.0.0.2 | 2.0.0.3 | 2.0.0.4 | 2.0.0.5 | 2.0.0.6 | 2.0.0.7 | 2.0.0.8 | 2.0.0.9 | 2.0.0.10 | 2.0.0.11 | 2.0.0.12 | 2.0.0.13 | 2.0.0.14 | 2.0.0.15 | 2.0.0.16 | 2.0.0.17 | 2.0.0.18 | 2.0.0.19 | 2.0.0.20 | 2.0.0.21 | 2.0_.1 | 2.0_.4 | 2.0_.5 | 2.0_.6 | 2.0_.7 | 2.0_.9 | 2.0_.10 | 2.0_8 | 3.0 | 3.0:alpha | 3.0:beta2 | 3.0:beta5 | 3.0.1 | 3.0.2 | 3.0.3 | 3.0.4 | 3.0.5 | 3.0.6 | 3.0.7 | 3.0.8 | 3.0.9
  • seamonkey≤ 1.1.16 | 1.0 | 1.0:alpha | 1.0:beta | 1.0.1 | 1.0.3 | 1.0.4 | 1.0.6 | 1.0.8 | 1.0.9 | 1.0.99 | 1.1 | 1.1:alpha | 1.1:beta | 1.1.1 | 1.1.3 | 1.1.5 | 1.1.5:1.1.10 | 1.1.6 | 1.1.7 | 1.1.8 | 1.1.9 | 1.1.10 | 1.1.11 | 1.1.12 | 1.1.13 | 1.1.15

1 vendor · 2 products

References

19 links
Show all 19 references