CVE-2020-1920
A regular expression denial of service (ReDoS) vulnerability in the validateBaseUrl function can cause the application to use excessive resources, become unresponsive, or crash.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.36%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A regular expression denial of service (ReDoS) vulnerability in the validateBaseUrl function can cause the application to use excessive resources, become unresponsive, or crash. This was introduced in react-native version 0.59.0 and fixed in version 0.64.1.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.36% probability · 72th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-1333, CWE-697
- Affected
- facebook/react-native
- Source
- cve-assign@fb.com
EPSS 1.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/facebook/react-native/commit/ca09ae82715e33c9ac77b3fa55495cf84ba891c7Patch, Third Party Advisory
- https://github.com/facebook/react-native/releases/tag/v0.64.1Release Notes, Third Party Advisory
- https://github.com/facebook/react-native/commit/ca09ae82715e33c9ac77b3fa55495cf84ba891c7Patch, Third Party Advisory
- https://github.com/facebook/react-native/releases/tag/v0.64.1Release Notes, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.