CVE-2021-35977
CRITICALCVSS 9.8/10EPSS 1.53%
Last modified
CVE-2021-35977 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. EPSS estimates a 1.53% chance of exploitation in the next 30 days.
Description
An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. This could result in arbitrary code execution.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Digi | Realport | <= 1.9-40 |
| Digi | Realport | <= 4.8.488.0 |
| Digi | Connectport Ts 8\/16 Firmware | All versions |
| Digi | Connectport Lts 8\/16\/32 Firmware | All versions |
| Digi | Passport Integrated Console Server Firmware | All versions |
| Digi | Cm Firmware | All versions |
| Digi | Portserver Ts Firmware | All versions |
| Digi | Portserver Ts Mei Firmware | All versions |
| Digi | Portserver Ts Mei Hardened Firmware | All versions |
| Digi | Portserver Ts M Mei Firmware | All versions |
| Digi | 6350-Sr Firmware | All versions |
| Digi | Portserver Ts P Mei Firmware | All versions |
| Digi | Transport Wr11 Xt Firmware | All versions |
| Digi | One Iap Family Firmware | All versions |
| Digi | One Ia Firmware | All versions |
| Digi | Wr31 Firmware | All versions |
| Digi | Wr44 R Firmware | All versions |
| Digi | Connect Es Firmware | All versions |
| Digi | Wr21 Firmware | All versions |
References
- https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txtThird Party Advisory
- https://raw.githubusercontent.com/reidmefirst/vuln-disclosure/main/2021-02.txtThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-35977?
An issue was discovered in Digi RealPort for Windows through 4.8.488.0. A buffer overflow exists in the handling of ADDP discovery response messages. This could result in arbitrary code execution.
How severe is CVE-2021-35977?
CVE-2021-35977 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.53% probability of exploitation in the next 30 days.
How do I fix CVE-2021-35977?
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-2021-35977?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST