What it is
CVE-2015-4495 is an unauthenticated vulnerability affecting Mozilla Firefox. The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2015-4495
Firefox
Mozilla / Firefox
- Severity
- CVSS 8.8 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 68.6%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV.
Who is affected?
Mozilla / Firefox.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Firefox
The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass the Same Origin Policy, and read arbitrary files or gain privileges, via vectors involving crafted JavaScript code and a native setter, as exploited in the wild in August 2015.
- Published
- 08 Aug 2015
- Exploitation Reported
- 25 May 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- Required
Tags
java
cisa
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2015-4495
- SUSE-SU-2015:1379 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00009...
- SUSE-SU-2015:1380 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00010...
- RHSA-2015:1581 rhn.redhat.com · Vendor Advisory http://rhn.redhat.com/errata/RHSA-2015-1581.html
- GLSA-201512-10 security.gentoo.org · Vendor Advisory https://security.gentoo.org/glsa/201512-10
- openSUSE-SU-2015:1389 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00014...
- USN-2707-1 ubuntu.com · Vendor Advisory http://www.ubuntu.com/usn/USN-2707-1
- SUSE-SU-2015:1528 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00016...
- SUSE-SU-2015:1449 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021...
- openSUSE-SU-2015:1390 lists.opensuse.org · Vendor Advisory http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00015...
- 37772 exploit-db.com · Exploit https://www.exploit-db.com/exploits/37772/
- 76249 securityfocus.com · VDB Entry http://www.securityfocus.com/bid/76249
- 1033216 securitytracker.com · VDB Entry http://www.securitytracker.com/id/1033216
- bugzilla.mozilla.org/show_bug.cgi bugzilla.mozilla.org · CVE Record https://bugzilla.mozilla.org/show_bug.cgi?id=1179262
- oracle.com/technetwork/topics/security/bulletinapr2016-... oracle.com · CVE Record http://www.oracle.com/technetwork/topics/security/bulletinapr2016-295...
- bugzilla.mozilla.org/show_bug.cgi bugzilla.mozilla.org · CVE Record https://bugzilla.mozilla.org/show_bug.cgi?id=1178058
- blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in... blog.mozilla.org · CVE Record https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in...
- mozilla.org/security/announce/2015/mfsa2015-78.html mozilla.org · CVE Record http://www.mozilla.org/security/announce/2015/mfsa2015-78.html
Exploitation evidence
Why Previdian marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
A trusted third party reported exploitation.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the Previdian Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-05-25 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- User-Agents
- Callback hosts
- 0
- 0
- 0
Request targets and User-Agents available in Pro. Callback host details available in Enterprise.
Scanner coverage
No scanner integrations recorded yet.
Virtual patch status
No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.8
High
Potential damage if exploited. Separate from whether attackers are using it.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
68.6%
Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.
Weaknesses
All CVSS Scores
CVSS v3.1
8.8
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v2.0
4.3
Medium
AV:N/AC:M/Au:N/C:P/I:N/A:N
Timeline
From disclosure to observed exploitation
-
00:00 UTC
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
00:00 UTC
CVE published
Vulnerability disclosed publicly
-
00:00 UTC
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2015-4495
Free JSON includes basic KEV fields{
"cve_id": "CVE-2015-4495",
"confidence": "Confirmed",
"cvss_score": 8.8,
"cvss_estimated": false,
"epss_score": 0.68558,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}