Use-after-free vulnerability in the CanvasRenderingContext2D implementation in Mozilla Firefox before 40.0.3 and Firefox ESR 38.x before 38.
Use-after-free vulnerability in the CanvasRenderingContext2D implementation in Mozilla Firefox before 40.0.3 and Firefox ESR 38.x before 38.2.1 allows remote attackers to execute arbitrary code by leveraging improper interaction between resize events and changes to Cascading Style Sheets (CSS) token sequences for a CANVAS element.
- Published
- Aug 29, 2015
- Updated
- Jun 16, 2026
- EPSS
- 8.0% · 95th percentile
- CWE
- —
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Report tools
Action score
42
Plan
Add it to your regular patch cycle.
- CVSS
- 40 / 40 · 10.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 8.0%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mozilla | firefox | cpe:2.3:a:mozilla:firefox |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- mozilla firefox38.0
- mozilla firefox38.0.1
- mozilla firefox38.0.5
- mozilla firefox38.1.0
- mozilla firefox38.2.0
- mozilla firefox40.0.2
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:7 | iceweasel | before 38.2.1esr-1~deb7u1 | 38.2.1esr-1~deb7u1 |
| Debian:8 | iceweasel | before 38.2.1esr-1~deb8u1 | 38.2.1esr-1~deb8u1 |
| Red Hat:enterprise_linux:5::client | firefox | before 0:38.2.1-1.el5_11 | 0:38.2.1-1.el5_11 |
| Red Hat:enterprise_linux:5::client | firefox-debuginfo | before 0:38.2.1-1.el5_11 | 0:38.2.1-1.el5_11 |
| Red Hat:enterprise_linux:6::client | firefox | before 0:38.2.1-1.el6_7 | 0:38.2.1-1.el6_7 |
| Red Hat:enterprise_linux:6::client | firefox-debuginfo | before 0:38.2.1-1.el6_7 | 0:38.2.1-1.el6_7 |
| Red Hat:enterprise_linux:7::client | firefox | before 0:38.2.1-1.el7_1 | 0:38.2.1-1.el7_1 |
| Red Hat:enterprise_linux:7::client | firefox-debuginfo | before 0:38.2.1-1.el7_1 | 0:38.2.1-1.el7_1 |
| SUSE:Linux Enterprise Desktop 12 | mozilla-nss | before 3.19.2.0-26.2 | 3.19.2.0-26.2 |
| SUSE:Linux Enterprise Desktop 12 | MozillaFirefox | before 38.2.1esr-45.1 | 38.2.1esr-45.1 |
| SUSE:Linux Enterprise Desktop 12 | MozillaFirefox-branding-SLE | before 31.0-14.1 | 31.0-14.1 |
| SUSE:Linux Enterprise Server 11 SP1-LTSS | MozillaFirefox | before 38.2.1esr-17.1 | 38.2.1esr-17.1 |
Same product
mozilla: all recordsOther highest-scoring records for the same primary product.
- CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV94Now
- CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV87Now
- CVE-2015-4495The 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 bypassKEV86Now
- CVE-2013-1690Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before 17.0.7 do not properKEV86Now
- CVE-2019-17026Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion.KEV79This week
- CVE-2024-9680An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines.KEV76This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:iceweasel | 38.2.1esr-1~deb7u1 · Debian:7 | Package registry (OSV) |
| red hat:firefox | 0:38.2.1-1.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:firefox-debuginfo | 0:38.2.1-1.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| suse:mozilla-nss | 3.19.2.0-26.2 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:MozillaFirefox | 38.2.1esr-45.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
| suse:MozillaFirefox-branding-SLE | 31.0-14.1 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- C · data can be read
- Integrity
- C · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- C
- Integrity impact
- C
- Availability impact
- C
Weakness class (CWE)
—
CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2015-09/msg00013.html
- lists.opensuse.org/opensuse-security-announce/2015-11/msg00025.html
- lists.opensuse.org/opensuse-updates/2015-09/msg00000.html
- rhn.redhat.com/errata/RHSA-2015-1693.html
- www.debian.org/security/2015/dsa-3345
- www.mozilla.org/security/announce/2015/mfsa2015-94.html
- www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- www.securityfocus.com/bid/76502
- www.securitytracker.com/id/1033397
- www.ubuntu.com/usn/USN-2723-1
- www.zerodayinitiative.com/advisories/ZDI-15-406
- bugzilla.mozilla.org/show_bug.cgi?id=1164766
- bugzilla.mozilla.org/show_bug.cgi?id=1175278
Vendor advisories and official records. Exploit/PoC links are deliberately left out.