CVE-2021-28998
HIGHCVSS 7.2/10EPSS 1.29%
Last modified
CVE-2021-28998 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. File upload vulnerability in CMS Made Simple through 2.2.15 allows remote authenticated attackers to gain a webshell via a crafted phar file.. EPSS estimates a 1.29% chance of exploitation in the next 30 days.
Description
File upload vulnerability in CMS Made Simple through 2.2.15 allows remote authenticated attackers to gain a webshell via a crafted phar file.
Metrics
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cmsmadesimple | Cms Made Simple | <= 2.2.15 |
References
- https://seclists.org/fulldisclosure/2021/Mar/50Mailing List, Third Party Advisory
- https://seclists.org/fulldisclosure/2021/Mar/50Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-28998?
File upload vulnerability in CMS Made Simple through 2.2.15 allows remote authenticated attackers to gain a webshell via a crafted phar file.
How severe is CVE-2021-28998?
CVE-2021-28998 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-28998?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-28998?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST