Vulnerability · Published Mar 25, 2020 · Assigned by mozilla
CVE-2020-6806
High 8.8
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 2.6% (higher than 85% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)2.6%top 14.5% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.21 | firefox | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.22 | firefox | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.23 | firefox | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.20 | firefox-esr | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.21 | firefox-esr | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.22 | firefox-esr | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.23 | firefox-esr | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.21 | librewolf | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.22 | librewolf | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.23 | librewolf | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.24 | librewolf | 74.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.20 | thunderbird | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.21 | thunderbird | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.22 | thunderbird | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Alpine:v3.23 | thunderbird | 68.6.0-r0 | ALPINE-CVE-2020-6806 |
| Debian:12 | firefox-esr | 68.6.0esr-1 | DEBIAN-CVE-2020-6806 |
| Debian:13 | firefox-esr | 68.6.0esr-1 | DEBIAN-CVE-2020-6806 |
| Debian:14 | firefox-esr | 68.6.0esr-1 | DEBIAN-CVE-2020-6806 |
| Debian:12 | thunderbird | 1:68.6.0-1 | DEBIAN-CVE-2020-6806 |
| Debian:13 | thunderbird | 1:68.6.0-1 | DEBIAN-CVE-2020-6806 |
| Debian:14 | thunderbird | 1:68.6.0-1 | DEBIAN-CVE-2020-6806 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 68.6 |
| Mozilla | Firefox | unspecified – before 74unspecified – before ESR68.6 |
| Mozilla | Firefox ESR | unspecified – before 68.6 |
References
- https://www.mozilla.org/security/advisories/mfsa2020-08/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-10/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-09/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1612308 x_refsource_MISC
- USN-4328-1 vendor-advisory, x_refsource_UBUNTU
- USN-4335-1 vendor-advisory, x_refsource_UBUNTU
- http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseInternal-Out-Of-Bounds-Access.html x_refsource_MISC