PatchTheCVECVE-2021-4097: phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
CVE-2021-4097 is a medium-severity flaw (CVSS 5.4) affecting php server monitor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.4 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 41%) |
| CISA exploited list | No |
| Weakness | CWE-93 |
| Published | 2021-12-12 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-4097?
php server monitor: upgrade to 3.6.0. Exact commands for each OS are on this page.
Is CVE-2021-4097 being exploited?
CVE-2021-4097 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-4097 affect?
CVE-2021-4097 affects php server monitor. Severity is medium (CVSS 5.4). phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
How urgent is CVE-2021-4097?
Priority 39/100. Public exploit reference
Software pages
Related CVEs
- CVE-2021-4241 LOW 2.6 MITIGATE A vulnerability, which was classified as problematic, was found in phpservermon
- CVE-2021-4240 LOW 2.6 MITIGATE A vulnerability, which was classified as problematic, was found in phpservermon