CVE-2021-4097
CRLF Injection in phpservermon/phpservermon
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
CRLF Injection in phpservermon/phpservermon
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
- Record
CVE-2021-4097- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L - Weakness
- CWE-93
- Updated
- 2026-11-02
EUVDEUVD-2021-2485
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
- Record
EUVD-2021-2485- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-8qv8-fq5w-p966
phpservermon is vulnerable to CRLF Injection
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences.
- Record
GHSA-8qv8-fq5w-p966- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L - Weakness
- CWE-93
- Updated
- 2026-11-02
NVD
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
- Record
CVE-2021-4097- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N - CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L - CVSS 2.0
- 5.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:N - Weakness
- CWE-93
- Updated
- 2026-11-02
OSV
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
- Record
CVE-2021-4097- CVSS 3.1
- 5.4 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-8qv8-fq5w-p966
phpservermon is vulnerable to CRLF Injection
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences.
- Record
GHSA-8qv8-fq5w-p966- CVSS 3.0
- 6.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L - Weakness
- CWE-93
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
phpservermon/phpservermonPackagist |
through 3.5.2 | None known |
phpservermon/phpservermonPackagist |
through 3.5.2, plus listed versions v3.1.0v3.1.1v3.2.0v3.2.0-rc1v3.2.1 Show 13 moreShow lessv3.2.2v3.3.0v3.3.1v3.3.2v3.4.0v3.4.1v3.4.2v3.4.3v3.4.4v3.4.5v3.5.0v3.5.1v3.5.2 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-4097 is a medium vulnerability (CVSS 6.3) in Phpservermon Phpservermon/phpservermon, published December 11, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.87%, the 59th percentile. No source names a fixed version.