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Weekly Signal
Live intelligence Updated 20 Aug 2026 · 23:28 UTC

Canonical, Debian, Mozilla +3 more · Ubuntu Linux, Debian Linux, Firefox +13 more

CVE-2013-1690

Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. Mozilla Security advisory Mfsa2013 53

View response plan
CVSS8.8
EPSS69.0%
KEVYes
ExploitationConfirmed exploitation
RemediationNot yet verified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 69.0%; technical severity is CVSS 8.8.

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properly handle onreadystatechange events in conjunction with page reloading, which allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted web site that triggers an attempt to execute data at an unmapped memory location.

Who should care

  • Teams operating Ubuntu Linux, Debian Linux, Firefox +13 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Ubuntu Linux, Debian Linux, Firefox +13 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. Mozilla Security advisory Mfsa2013 53
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE
CWE-119
Affected versions
Canonical Ubuntu Linux (Version 12.04 | Version 12.10 | Version 13.04); Debian Debian Linux (Version 7.0); Mozilla Firefox (End Excluding 22.0 | Start Including 17.0, End Excluding 17.0.7); Mozilla Firefox and Thunderbird; Mozilla Thunderbird (End Excluding 17.0.7); Mozilla Thunderbird Esr (Start Including 17.0, End Excluding 17.0.7); Opensuse Opensuse (Version 11.4 | Version 12.2 | Version 12.3); Redhat Enterprise Linux Desktop (Version 5.0 | Version 6.0)
Fixed versions
Mozilla Firefox (Fixed from 22.0, 17.0.7); Mozilla Thunderbird (Fixed from 17.0.7); Mozilla Thunderbird Esr (Fixed from 17.0.7)
Published
26 June 2013
Attack vector
Network
Privileges required
None
User interaction
Required

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 69.0%
  4. Signal calculated at 80

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.