CVE-2023-6707 — Use after free in CSS in Google Chrome prior to 120

Use after free in CSS in Google Chrome prior to 120.0.6099.109 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)

01What is this vulnerability?

Use after free in CSS in Google Chrome prior to 120.0.6099.109 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: Medium)

02Affected products

Vendor	Product	Versions
Google	Chrome	120.0.6099.109

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

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

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

• Published: 2023-12-14T21:48:42.519Z
• Last modified: 2026-02-25T17:05:22.255Z

09References

• chromereleases.googleblog.com — https://chromereleases.googleblog.com/2023/12/stable-channel-update-for-desktop_…
• crbug.com — https://crbug.com/1504036
• lists.fedoraproject.org — https://lists.fedoraproject.org/archives/list/[email protected]…
• security.gentoo.org — https://security.gentoo.org/glsa/202401-34