An out-of-bounds write in "ClearKeyDecryptor" while decrypting some Clearkey-encrypted media content.
An out-of-bounds write in "ClearKeyDecryptor" while decrypting some Clearkey-encrypted media content. The "ClearKeyDecryptor" code runs within the Gecko Media Plugin (GMP) sandbox. If a second mechanism is found to escape the sandbox, this vulnerability allows for the writing of arbitrary data within memory, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
- Published
- Jun 11, 2018
- Updated
- Jun 16, 2026
- EPSS
- 2.1% · 81th percentile
- CWE
- CWE-787
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 34 / 40 · 8.6 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.1%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| redhat | enterprise linux desktop | cpe:2.3:o:redhat:enterprise_linux_desktop |
| redhat | enterprise linux server | cpe:2.3:o:redhat:enterprise_linux_server |
| redhat | enterprise linux server aus | cpe:2.3:o:redhat:enterprise_linux_server_aus |
| redhat | enterprise linux server eus | cpe:2.3:o:redhat:enterprise_linux_server_eus |
| redhat | enterprise linux workstation | cpe:2.3:o:redhat:enterprise_linux_workstation |
| 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.
- debian debian linux7.0
- mozilla firefoxbefore 53.0
- mozilla firefoxbefore 45.9.0
- mozilla firefox52.0 and later · before 52.1.0
- redhat enterprise linux6.0
- redhat enterprise linux7.0
- redhat enterprise linux desktop6.0
- redhat enterprise linux desktop7.0
- redhat enterprise linux server6.0
- redhat enterprise linux server7.0
- redhat enterprise linux server aus7.3
- redhat enterprise linux server aus7.4
- redhat enterprise linux server eus7.3
- redhat enterprise linux server eus7.4
- redhat enterprise linux server eus7.5
- redhat enterprise linux workstation6.0
- redhat enterprise linux workstation7.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.
Mozilla Firefox
- unspecified and later · before 53affected
Mozilla Firefox ESR
- unspecified and later · before 45.9affected
- unspecified and later · before 52.1affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | firefox-esr | before 45.9.0esr-1 | 45.9.0esr-1 |
| Debian:7 | firefox-esr | before 45.9.0esr-1~deb7u1 | 45.9.0esr-1~deb7u1 |
| Debian:8 | firefox-esr | before 45.9.0esr-1~deb8u1 | 45.9.0esr-1~deb8u1 |
| Red Hat:enterprise_linux:6::client | firefox | before 0:52.1.0-2.el6_9 | 0:52.1.0-2.el6_9 |
| Red Hat:enterprise_linux:6::client | firefox-debuginfo | before 0:52.1.0-2.el6_9 | 0:52.1.0-2.el6_9 |
| SUSE:Linux Enterprise Point of Sale 11 SP3 | firefox-gcc5 | before 5.3.1+r233831-7.1 | 5.3.1+r233831-7.1 |
| SUSE:Linux Enterprise Point of Sale 11 SP3 | firefox-libffi-gcc5 | before 5.3.1+r233831-7.1 | 5.3.1+r233831-7.1 |
| SUSE:Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox-branding-SLED | before 52-24.3.44 | 52-24.3.44 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | mozilla-nss | before 3.29.5-47.3.2 | 3.29.5-47.3.2 |
| SUSE:Linux Enterprise Software Development Kit 11 SP4 | MozillaFirefox | before 52.2.0esr-72.5.2 | 52.2.0esr-72.5.2 |
| SUSE:OpenStack Cloud 6 | MozillaFirefox | before 52.2.0esr-108.3 | 52.2.0esr-108.3 |
| SUSE:OpenStack Cloud 6 | MozillaFirefox-branding-SLE | before 52-31.1 | 52-31.1 |
Same product
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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:firefox-esr | 45.9.0esr-1 · Debian:12 | Package registry (OSV) |
| red hat:firefox | 0:52.1.0-2.el6_9 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:firefox-debuginfo | 0:52.1.0-2.el6_9 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| suse:firefox-gcc5 | 5.3.1+r233831-7.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package registry (OSV) |
| suse:firefox-libffi-gcc5 | 5.3.1+r233831-7.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package registry (OSV) |
| suse:mozilla-nss | 3.29.5-47.3.2 · SUSE:Linux Enterprise Software Development Kit 11 SP4 | Package registry (OSV) |
| suse:MozillaFirefox | 52.2.0esr-108.3 · SUSE:OpenStack Cloud 6 | Package registry (OSV) |
| suse:MozillaFirefox-branding-SLE | 52-31.1 · SUSE:OpenStack Cloud 6 | Package registry (OSV) |
| suse:MozillaFirefox-branding-SLED | 52-24.3.44 · SUSE:Linux Enterprise Point of Sale 11 SP3 | 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
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
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✗ → ✓
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References
- www.securityfocus.com/bid/97940
- www.securitytracker.com/id/1038320
- access.redhat.com/errata/RHSA-2017:1104
- access.redhat.com/errata/RHSA-2017:1106
- bugzilla.mozilla.org/show_bug.cgi?id=1346648
- www.debian.org/security/2017/dsa-3831
- www.mozilla.org/security/advisories/mfsa2017-10/
- www.mozilla.org/security/advisories/mfsa2017-11/
- www.mozilla.org/security/advisories/mfsa2017-12/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.