Security readout for executives and security teams
Plain-English summary
json8 versions before 1.0.3 can let untrusted path data alter JavaScript object prototypes. In business terms, affected applications may make unsafe assumptions about object properties, with the CVSS vector indicating possible high confidentiality impact. Urgency is moderate unless json8 processes untrusted user-controlled paths in exposed workflows.
Executive priority
Treat as a moderate dependency remediation. It is not known exploited from the provided evidence, but prototype pollution can create hard-to-predict application behavior. Prioritize systems where json8 handles external input or sensitive data transformations.
Technical view
CVE-2020-7770 is prototype pollution in the json8 package before 1.0.3. The affected function adds a property to a target object from a supplied path but does not properly reject unsafe keys. The published CVSS 3.1 score is 6.5, network reachable, low complexity, no privileges required, user interaction required, and high confidentiality impact.
Likely exposure
Exposure is limited to JavaScript applications that use json8 before 1.0.3, directly or transitively, especially where path input can be influenced by users or external data. The source bundle does not identify specific downstream products, platforms, or hosted services.
Exploitation context
The provided sources do not show CISA KEV listing or cited active exploitation. Exploitability depends on whether an application passes untrusted path values into the vulnerable json8 function and whether polluted prototype state can influence sensitive logic.
Researcher notes
The source evidence names json8 before 1.0.3 and describes insufficient key validation during path-based property assignment. No CWE is listed in the bundle. Do not assume remote code execution or availability impact from these sources alone; the CVSS vector emphasizes confidentiality impact with required user interaction.
Mitigation direction
- Upgrade json8 to version 1.0.3 or later.
- Check direct and transitive dependencies for json8 before 1.0.3.
- Review vendor advisory and patch commit before release approval.
- Prioritize exposed workflows that process user-controlled JSON paths.
- Run regression tests around affected JSON object handling.
Validation and detection
- Confirm production dependency inventory includes no json8 version before 1.0.3.
- Verify lockfiles and deployed artifacts match the remediated version.
- Identify code paths passing external path values into json8.
- Review SCA results for CVE-2020-7770 closure.
- Test relevant workflows for unexpected inherited object properties.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2020-7770 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
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:R/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://snyk.io/vuln/SNYK-JS-JSON8-1017116CVE reference · x_refsource_MISC
- https://github.com/sonnyp/JSON8/commit/2e890261b66cbc54ae01d0c79c71b0fd18379e7eCVE 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.