Vulnerability · Published Apr 24, 2020 · Assigned by mozilla
CVE-2020-6821
High 7.5
In plain English
A high-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.5%top 25.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.21 | firefox | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.22 | firefox | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.23 | firefox | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.20 | firefox-esr | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.21 | firefox-esr | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.22 | firefox-esr | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.23 | firefox-esr | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.21 | librewolf | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.22 | librewolf | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.23 | librewolf | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.24 | librewolf | 75.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.20 | thunderbird | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.21 | thunderbird | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.22 | thunderbird | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Alpine:v3.23 | thunderbird | 68.7.0-r0 | ALPINE-CVE-2020-6821 |
| Debian:12 | firefox-esr | 68.7.0esr-1 | DEBIAN-CVE-2020-6821 |
| Debian:13 | firefox-esr | 68.7.0esr-1 | DEBIAN-CVE-2020-6821 |
| Debian:14 | firefox-esr | 68.7.0esr-1 | DEBIAN-CVE-2020-6821 |
| Debian:12 | thunderbird | 1:68.7.0-1 | DEBIAN-CVE-2020-6821 |
| Debian:13 | thunderbird | 1:68.7.0-1 | DEBIAN-CVE-2020-6821 |
| Debian:14 | thunderbird | 1:68.7.0-1 | DEBIAN-CVE-2020-6821 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 68.7.0 |
| Mozilla | Firefox ESR | unspecified – before 68.7 |
| Mozilla | Firefox | unspecified – before 75 |
References
- https://www.mozilla.org/security/advisories/mfsa2020-13/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-12/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-14/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1625404 x_refsource_MISC
- USN-4335-1 vendor-advisory, x_refsource_UBUNTU