CVE-2020-28501
Regular Expression Denial of Service (ReDoS)
This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Regular Expression Denial of Service (ReDoS)
This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
- Record
CVE-2020-28501- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
EUVDEUVD-2021-0844
This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
- Record
EUVD-2021-0844- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jxg6-fhwc-9v9c
Regular Expression Denial of Service (ReDoS) in es6-crawler-detect
This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
- Record
GHSA-jxg6-fhwc-9v9c- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-400
- Updated
- 2026-11-02
NVD
This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
- Record
CVE-2020-28501- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
OSVGHSA-jxg6-fhwc-9v9c
Regular Expression Denial of Service (ReDoS) in es6-crawler-detect
This affects the package es6-crawler-detect before 3.1.3. No limitation of user agent string length supplied to regex operators.
- Record
GHSA-jxg6-fhwc-9v9c- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-400
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
es6-crawler-detectnpm |
before 3.1.3 | 3.1.3 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-28501 is a medium vulnerability (CVSS 5.3) in Crawlerdetect Project Crawlerdetect, published March 22, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.50%, the 74th percentile. Fixed in es6-crawler-detect 3.1.3.