Back
CVE-2020-15656
JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various…
High8.8EPSS 1.5%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 1.5% · top 25% of all CVEs (6 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Weakness
- Type confusion for special arguments in IonMonkey
- CWE-843 (opens in a new tab)All about CWE-843 and its CVEs
Affected products
- affected unspecified – < 78.1
- affected unspecified – < 79
- affected unspecified – < 78.1
References (6)
- https://www.mozilla.org/security/advisories/mfsa2020-30/ (opens in a new tab)x_refsource_MISCx_transferred
- https://www.mozilla.org/security/advisories/mfsa2020-32/ (opens in a new tab)x_refsource_MISCx_transferred
- https://www.mozilla.org/security/advisories/mfsa2020-33/ (opens in a new tab)x_refsource_MISCx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1647293 (opens in a new tab)x_refsource_MISCx_transferred
- openSUSE-SU-2020:1189 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- USN-4443-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-15656)Record last updated .