Threats / Mozilla / CVE-2016-9079
CVE-2016-9079
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Mozilla Firefox, Firefox ESR, and Thunderbird vulnerability
Use-after-free vulnerability in SVG Animation affecting Mozilla Firefox, Firefox ESR, and Thunderbird. Exploited in the wild with high exploitation probability.
Verdict
Today item — known-exploited.
A use-after-free flaw in SVG Animation processing allows attackers to execute arbitrary code through malicious SVG content. Active exploitation in the wild indicates immediate risk to users of affected Mozilla products.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
3 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 2023-06-22).
Probability (EPSS)
EPSS 0.87921 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Mozilla, Firefox, Firefox ESR, and Thunderbird. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-416 Use After Free — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
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
Craft malicious SVG content that triggers improper memory handling in the animation parser
Business
User systems compromised through browser exploitation, enabling data theft, malware installation, or lateral network movement
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Deliver the malicious SVG via web pages, email attachments, or compromised websites
Business
Widespread user compromise across consumer and enterprise endpoints running vulnerable Firefox or Thunderbird versions
3
Lateral reach — past segmentation narrative 3
Attacker
Achieve code execution with browser process privileges to establish persistence or exfiltrate credentials
Business
Organizational data breach, credential compromise, and potential supply chain impact if targeted at enterprise users
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