PatchTheCVECVE-2020-7707: The package property-expr before 2.0.3 are vulnerable to Prototype Pollution via the setter function.
CVE-2020-7707 is a critical-severity flaw (CVSS 9.8) affecting property-expr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The package property-expr before 2.0.3 are vulnerable to Prototype Pollution via the setter function.
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.4% (top 11%) |
| CISA exploited list | No |
| Weakness | CWE-1321 |
| Published | 2020-08-18 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-7707?
property-expr: upgrade to 2.0.3. Exact commands for each OS are on this page.
Is CVE-2020-7707 being exploited?
CVE-2020-7707 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-7707 affect?
CVE-2020-7707 affects property-expr. Severity is critical (CVSS 9.8). The package property-expr before 2.0.3 are vulnerable to Prototype Pollution via the setter function.
How urgent is CVE-2020-7707?
Priority 66/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action