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CVE-2020-1920

19
FAUCET Score

CVE-2020-1920 is a Regular Expression Denial of Service (ReDoS) vulnerability affecting Facebook React Native versions 0.59.0 through 0.64.0. This flaw in the validateBaseUrl function can lead to excessive resource consumption, unresponsiveness, or application crashes. With a CVSS score of 7.5 (High), this vulnerability can be exploited remotely with low attack complexity, resulting in a high impact on availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.59.0, < 0.64.1CPE matchmatch criteria
cpe:2.3:a:facebook:react-native:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.36%
Probability of exploitation in next 30 days
EPSS Percentile
68.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0136 is in the 49th percentile among its peer group of 51,485 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: react-nativeFixed in: 0.62.3
npmpatch availablevia ghsa
Product: react-nativeFixed in: 0.64.1

Vendor Advisories (1)

npmGHSA-7f53-fmmv-mfjvhigh

Regular expression denial of service in react-native

Jul 20, 2021

References

github.com / facebook/react-native/commit/ca09ae82715e33c9ac77b3fa55495cf84ba891c7
PatchThird Party Advisory
github.com / facebook/react-native/releases/tag/v0.64.1
Release NotesThird Party Advisory