SARA / Free Tools / CVE / CVE-2019-11763

CVE-2019-11763 — Failure to correctly handle null bytes when processing HTML entities resulted in

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have als

CVSS
— —
EPSS
2.23% (top 15.70%)
CWE
—
Published
2020-01-08T19:59:44.000Z
Last modified
2024-08-04T23:03:32.794Z
CVSS vector
—

01What is this vulnerability?

Failure to correctly handle null bytes when processing HTML entities resulted in Firefox incorrectly parsing these entities. This could have led to HTML comment text being treated as HTML which could have led to XSS in a web application under certain conditions. It could have also led to HTML entities being masked from filters - enabling the use of entities to mask the actual characters of…

02Affected products

VendorProductVersions
MozillaFirefoxbefore 70
MozillaThunderbirdbefore 68.2
MozillaFirefox ESRbefore 68.2

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

Want this in your SOAR or SIEM?
SARA's API returns EPSS, CVSS, KEV, and an analyst-grade summary in one call.
Read the API reference →
EPSS detail → Search KEV → Ask SARA →