# CVE-2020-7793: Regular Expression Denial of Service (ReDoS)

- Exploited (CISA KEV): no
- Published: 2020-12-11
- CVSS: 7.5 HIGH (v3.1)
- EPSS: 3.9% (90th percentile)

The package ua-parser-js before 0.7.23 are vulnerable to Regular Expression Denial of Service (ReDoS) in multiple regexes (see linked commit for more info).

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Rule published | 2023-01-17 | 767 |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

### F5

- 2023-01-17 · new · rule 200012081
  > Added: signature 200012081 "UAParser.js ReDoS" (Denial of Service, risk Medium), systems: Node.js. References: CVE-2020-7793.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2023-02-14 · new · rule 200012081
  > Added: signature 200012081 "UAParser.js ReDoS" (Denial of Service, risk Medium), systems: Node.js. References: CVE-2020-7793.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2023-08-08 · updated · rule 200012081
  > Updated: signature 200012081 "UAParser.js ReDoS" (Denial of Service, risk Medium), systems: Node.js. References: CVE-2020-7793.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog
- 2023-09-12 · updated · rule 200012081
  > Updated: signature 200012081 "UAParser.js ReDoS" (Denial of Service, risk Medium), systems: Node.js. References: CVE-2020-7793.
  Source: https://docs.cloud.f5.com/docs-v2/platform/changelogs/security-details-changelog

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2020-7793 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2020-7793