Regular expression denial of service in nth-check
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2021-3803 |
| CWE-ID | CWE-185 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
nth-check Web applications / JS libraries |
| Vendor | fb55 |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Incorrect regular expression
EUVDB-ID: #VU76185
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2021-3803
CWE-ID:
CWE-185 - Incorrect Regular Expression
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient input validation when processing regular expressions. A remote attacker can pass specially crafted data to the application and perform regular expression denial of service (ReDos) attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsnth-check: 1.0.2 - 2.0.0
External linkshttp://github.com/fb55/nth-check/commit/9894c1d2010870c351f66c6f6efcf656e26bb726
http://huntr.dev/bounties/8cf8cc06-d2cf-4b4e-b42c-99fafb0b04d0
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
