Prototype Pollution in Async Project
CVE-2021-43138
In Async before 2.6.4 and 3.x before 3.2.2, a malicious user can obtain privileges via the mapValues() method, aka lib/internal/iterator.js createObjectIterator prototype pollution.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.033 (88.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.033 · newest: 0.033 · change: 0.000
Affected products
- Async Project
- Fedoraproject Fedora — versions 36, 37
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/caolan/async/blob/master/lib/internal/iterator.js (Third Party Advisory)
- github.com/caolan/async/blob/master/lib/mapValuesLimit.js (Third Party Advisory)
- jsfiddle.net/oz5twjd9/ (Exploit, Third Party Advisory)
- github.com/caolan/async/commit/e1ecdbf79264f9ab488c7799f4c76996d5dca66d (Patch, Third Party Advisory)
- github.com/caolan/async/blob/v2.6.4/CHANGELOG.md (Third Party Advisory, Release Notes)
- github.com/caolan/async/pull/1828 (Patch, Third Party Advisory)
- github.com/caolan/async/compare/v2.6.3...v2.6.4 (Patch, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20240621-0006/
Frequently asked questions
- What is CVE-2021-43138?
- CVE-2021-43138 is a high-severity vulnerability in Async Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 7.8/10. Published 2022-04-06.
- How severe is CVE-2021-43138?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-43138 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.