Threats / Mozilla / CVE-2024-9680
CVE-2024-9680
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-09-19
Mozilla Firefox vulnerability
Mozilla Firefox and Firefox ESR contain a use-after-free vulnerability in Animation timelines allowing code execution in the content process. Actively exploited in the wild and associated with ransomware campaigns.
Verdict
Today item, not a backlog item.
A use-after-free flaw in animation timeline handling enables attackers to execute arbitrary code within Firefox's content process. The vulnerability is under active exploitation and linked to ransomware operations, posing significant risk to users.
CISA KEV Yes · 2024-10-154Ransomware use Flagged4EPSS 0.23184 (verify live)5CVSS 9.8 (CISA)3CISA SSVC Exploitation: active · Automatable: yes · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
27 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-10-15), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.23184 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) · Affected: Mozilla, Firefox. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-416 Use After Free — weakness family: Memory safety.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 6 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious webpage containing specially crafted animation timeline objects that trigger use-after-free conditions when processed by the browser.
Business
Users visiting compromised or attacker-controlled websites face arbitrary code execution in their browser process, leading to data theft or system compromise.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I leverage the content process code execution to escape sandbox restrictions and gain elevated privileges on the victim's system.
Business
Successful privilege escalation enables deployment of ransomware or persistent malware, resulting in operational disruption and financial extortion.
3
Lateral reach — past segmentation narrative 3
Attacker
I distribute the exploit through drive-by downloads, malvertising, or phishing campaigns targeting Firefox users at scale.
Business
Mass infection campaigns compromise user endpoints, enabling large-scale ransomware deployment and organizational network infiltration.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by mozillaCNA
Credited with finding itDamien Schaeffer from ESETunspecified
Found an error? Propose a correction.
A correction is a cited counter-claim — it must cite a source,
gets reviewed by a second human, and is never auto-applied. See the
correction convention and our identity
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