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Vulnerabilities

Threat intelligence · CVE-2020-12405

Cisco discloses technical details for Firefox code execution flaw Security experts from Cisco Talos have released technical details on a recently addressed vulnerabili…

Published Jul 1, 2020 · the affected product

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2020-12405. EPSS is 1.35%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.35%
Remediation
Not established
Affected products
See sources for product scope

Cisco discloses technical details for Firefox code execution flaw Security experts from Cisco Talos have released technical details on a recently addressed vulnerability in Firefox, tracked as CVE-2020-12405, that could be exploited by attackers for remote code execution. The issue is a use-after-free in SharedWorkerService flaw and received a CVSS score of 8.8. The flaw was addressed by Mozilla along with other four

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2020-12405

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-12405. EPSS is 1.35%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 1.35%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jul 1, 2020 · AlienVault OTX

    Detected

    Cisco discloses technical details for Firefox code execution flaw Security experts from Cisco Talos have released technical details on a recently addressed vulnerability in Firefox, tracked as CVE-2020-12405, that could be exploited by attackers for remote code execution. The issue is a use-after-free in SharedWorkerService flaw and received a CVSS score of 8.8. The flaw was addressed by Mozilla a

Sources

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • AlienVault OTXNov 1, 2026