CVE-2021-33716
MEDIUMCVSS 6.5/10EPSS 0.24%
Last modified
CVE-2021-33716 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A vulnerability has been identified in SIMATIC CP 1543-1 (incl. SIPLUS variants) (All versions < V3.0), SIMATIC CP 1545-1 (All versions < V1.1). EPSS estimates a 0.24% chance of exploitation in the next 30 days.
Description
A vulnerability has been identified in SIMATIC CP 1543-1 (incl. SIPLUS variants) (All versions < V3.0), SIMATIC CP 1545-1 (All versions < V1.1). An attacker with access to the subnet of the affected device could retrieve sensitive information stored in cleartext.
Metrics
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Simatic Cp 1543-1 Firmware | < 3.0 |
| Siemens | Simatic Cp 1545-1 Firmware | < 1.1 |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-535997.pdfPatch, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-535997.pdfPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-33716?
A vulnerability has been identified in SIMATIC CP 1543-1 (incl. SIPLUS variants) (All versions < V3.0), SIMATIC CP 1545-1 (All versions < V1.1). An attacker with access to the subnet of the affected device could retrieve sensitive information stored in cleartext.
How severe is CVE-2021-33716?
CVE-2021-33716 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.
How do I fix CVE-2021-33716?
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-2021-33716?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST