Security readout for executives and security teams
Plain-English summary
CVE-2020-7767 is a denial-of-service risk in the express-validators npm package. A specially crafted invalid URL can make validation consume excessive processing time, potentially slowing or disrupting services that validate user-supplied URLs.
Executive priority
Treat as a moderate availability issue. Prioritize internet-facing services that validate user-submitted URLs, especially where disruption would affect customer access or business workflows.
Technical view
The issue is Regular Expression Denial of Service during URL validation in express-validators. The CVSS 3.1 score is 5.3, network-reachable, low complexity, unauthenticated, and impacts availability only. Provided sources list all package versions as vulnerable but do not name a fixed release.
Likely exposure
Exposure is likely limited to Node.js applications that directly depend on express-validators and validate untrusted URL input through the affected functionality.
Exploitation context
The source bundle shows KEV is false and provides no cited evidence of active exploitation. Exploitation would require sending crafted invalid URL input to a reachable validation path.
Researcher notes
Evidence is narrow: CVE and Snyk identify ReDoS in express-validators URL validation, with no CWE listed and no fixed version in the supplied bundle. Do not generalize this to similarly named packages without separate evidence.
Mitigation direction
- Inventory projects for the express-validators package in manifests, lockfiles, and deployed artifacts.
- Check Snyk and package maintainer guidance before choosing upgrade, replacement, or removal.
- Restrict untrusted URL validation paths with request size limits and application-level rate limiting.
- Consider replacing affected URL validation with maintained validation logic if no fixed release is available.
Validation and detection
- Confirm whether express-validators is present in dependency manifests or lockfiles.
- Map where the application validates user-supplied URLs using this package.
- Review logs and monitoring for unusual latency on URL validation endpoints.
- Test staging behavior with benign invalid URL cases and measure validation latency.
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-2020-7767 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/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:N/I:N/A:L/E:P/RL:U/RC:C3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:U/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://snyk.io/vuln/SNYK-JS-EXPRESSVALIDATORS-1017404CVE 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.