Vulnerability · Published Aug 10, 2020 · Assigned by mozilla
CVE-2020-15656
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 1.5% (higher than 75% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)1.5%top 25.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.21 | firefox | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.22 | firefox | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.23 | firefox | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.20 | firefox-esr | 78.1.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.21 | firefox-esr | 78.1.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.22 | firefox-esr | 78.1.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.23 | firefox-esr | 78.1.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.21 | librewolf | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.22 | librewolf | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.23 | librewolf | 79.0-r0 | ALPINE-CVE-2020-15656 |
| Alpine:v3.24 | librewolf | 79.0-r0 | ALPINE-CVE-2020-15656 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified – before 78.1 |
| Mozilla | Firefox | unspecified – before 79 |
| Mozilla | Thunderbird | unspecified – before 78.1 |
References
- https://www.mozilla.org/security/advisories/mfsa2020-30/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-32/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2020-33/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1647293 x_refsource_MISC
- openSUSE-SU-2020:1189 vendor-advisory, x_refsource_SUSE
- USN-4443-1 vendor-advisory, x_refsource_UBUNTU