CVE-2021-4097: phpservermon phpservermon/phpservermon CRLF Injection
CVSS: 6.3v3.0MediumModified
Published 11-12-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-4097 is a medium (CVSS 6.3) CRLF Injection vulnerability in phpservermon phpservermon/phpservermon. EPSS estimates a 0.87% chance of exploitation in the next 30 days, higher than 58.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.3/10
010
Medium · v3.0 (CVE.org)EPSS score
0.87%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 11-12-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
phpservermon is vulnerable to Improper Neutralization of CRLF Sequences
CVSS metrics
4 scores · 2 sources · 3 versionsMedium 5.4Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:NSourcesSingle source
Medium 6.3Preferred score · CVE.org (CNA)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:LSourcesAll 2 agree
- NVDNIST6.3MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Medium 5.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:NSourcesSingle source
EPSS trend
Probability
0.87%
Chance of exploitation in the next 30 days
Percentile
58%
Versus all other CVEs
30-day change
+0.03 pp
From 0.84% on 19-09-2026
19-09-202619-10-2026
EPSS score0.87%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (huntr.dev)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Phpservermon1 product
- phpservermon/phpservermon≥ unspecified, < 3.6.0
Phpservermonitor1 product
- php_server_monitor< 3.6.0
2 vendors · 2 products
References
2 links- huntr.dev/bounties/d617ced7-be06-4e34-9db0-63d45c003a43X Refsource CONFIRMExploitPatchThird Party Advisory
- github.com/phpservermon/phpservermon/commit/162bba0046fcda1580f4fbc7b9ababe3c7c13ce4X Refsource MISCPatchThird Party Advisory