# CVE-2021-4097: phpservermon is vulnerable to CRLF Injection

Source: https://junglewise.ai/threats/cve-2021-4097-phpservermon-is-vulnerable-to-crlf-injection  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2021-12-16  
License: CC BY 4.0 with a link back

CVE-2021-4097 · Severity: low · CVSS 3 · Published 2021-12-16

phpservermon is vulnerable to CRLF Injection

Technologies: [phpservermon/phpservermon (Packagist)](https://junglewise.ai/threats/technologies/phpservermon-phpservermon). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2021-4097 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2021-4097 being exploited in the wild.

**How severe is CVE-2021-4097?** Low severity, with a CVSS score of 3, published 16 December 2021.

**Which products and versions are affected?** phpservermon/phpservermon (Packagist) ECOSYSTEM:introduced=0,last_affected=3.5.2.

**Is there a fix for CVE-2021-4097?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2021-4097?** Check whether you run phpservermon/phpservermon (Packagist) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- phpservermon/phpservermon (Packagist) ECOSYSTEM:introduced=0,last_affected=3.5.2

## Identifiers

- CVE-2021-4097
- GHSA-8qv8-fq5w-p966

## Related threats

- [PHP Server Monitor vulnerable to Cross-site Scripting](https://junglewise.ai/threats/cve-2024-5312-php-server-monitor-vulnerable-to-cross-site-scripting)
- [Insufficient Entropy in PHPServerMon PRNG](https://junglewise.ai/threats/cve-2021-4240-insufficient-entropy-in-phpservermon-prng)
- [PHPServerMon PRNG has Insufficient Entropy](https://junglewise.ai/threats/cve-2021-4241-phpservermon-prng-has-insufficient-entropy)
- [CSRF in PHP Server Monitor before 3.3.2](https://junglewise.ai/threats/cve-2018-18921-csrf-in-php-server-monitor-before-3-3-2)