What’s Vulnerable › Vulnerabilities

CVE-2021-27293

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-07-12 · updated 2026-06-17
• Weakness: CWE-697

Description

RestSharp < 106.11.8-alpha.0.13 uses a regular expression which is vulnerable to Regular Expression Denial of Service (ReDoS) when converting strings into DateTimes. If a server responds with a malicious string, the client using RestSharp will be stuck processing it for an exceedingly long time. Thus the remote server can trigger Denial of Service.

Affected products

• RestSharp: through 106.11.7; 106.11.8-alpha0.10, 106.11.8-alpha0.11, 106.11.8-alpha0.12, 106.11.8-alpha0.2, 106.11.8-alpha0.3, 106.11.8-alpha0.4 (+2)

References

• https://github.com/restsharp/RestSharp/issues/1556
• https://restsharp.dev/
• https://github.com/restsharp/RestSharp/issues/1556
• https://restsharp.dev/

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