Security readout for executives and security teams
Plain-English summary
CVE-2020-7703 affects the JavaScript package nis-utils. The reported flaw is prototype pollution in its setValue function. In plain terms, unsafe object modification could let attacker-controlled data change shared object behavior inside an application. The source data rates this critical, but provides limited remediation detail.
Executive priority
Prioritize assessment for internet-facing JavaScript services and applications processing untrusted input. The severity is critical, but urgency should be based on dependency presence and reachability because the supplied evidence does not confirm active exploitation.
Technical view
All listed versions of nis-utils are reported vulnerable to prototype pollution through setValue. The supplied CVSS 3.1 vector is network-accessible, low-complexity, unauthenticated, and no user interaction, with high confidentiality, integrity, and availability impact. Actual impact depends on whether application-controlled or untrusted data reaches the vulnerable function.
Likely exposure
Exposure is most likely in Node.js or JavaScript applications that directly or transitively depend on nis-utils and pass untrusted object paths or values into setValue. The bundle identifies nis-utils version 0/all versions only; no other affected products are evidenced.
Exploitation context
The bundle does not cite active exploitation and marks KEV as false. The CVSS exploit maturity is proof-of-concept, so treat exploitability as plausible but not confirmed as exploited in the wild from these sources.
Researcher notes
Evidence is sparse: the CVE description identifies nis-utils and setValue, while the supplied CVSS indicates severe theoretical impact. Validate reachability before assuming application compromise. Do not infer affected ecosystems beyond nis-utils from the provided sources.
Mitigation direction
- Inventory direct and transitive nis-utils dependencies in application lockfiles.
- Check Snyk, CVE, and package maintainer guidance for fixed-version or retirement advice.
- Remove or replace nis-utils where no maintained safe version is available.
- Restrict untrusted input from reaching nis-utils setValue until remediation is confirmed.
Validation and detection
- Search package manifests and lockfiles for nis-utils.
- Generate a dependency tree to find transitive nis-utils usage.
- Review application code paths that call setValue or wrappers around it.
- Confirm whether user-controlled data can influence object paths or assigned values.
- Record package version, reachability, and remediation status in vulnerability tracking.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2020-7703 mapping review
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Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://snyk.io/vuln/SNYK-JS-NISUTILS-598799CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.