CVE-2021-38371
HIGHCVSS 7.5/10EPSS 2.00%
Last modified
CVE-2021-38371 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.. EPSS estimates a 2.00% chance of exploitation in the next 30 days.
Description
The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Exim | Exim | <= 4.94.2 |
References
- https://nostarttls.secvuln.infoTool Signature
- https://www.exim.orgProduct
- https://www.exim.org/static/doc/security/CVE-2021-38371.txtBroken Link, Vendor Advisory
- https://nostarttls.secvuln.infoTool Signature
- https://www.exim.orgProduct
- https://www.exim.org/static/doc/security/CVE-2021-38371.txtBroken Link, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-38371?
The STARTTLS feature in Exim through 4.94.2 allows response injection (buffering) during MTA SMTP sending.
How severe is CVE-2021-38371?
CVE-2021-38371 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.00% probability of exploitation in the next 30 days.
How do I fix CVE-2021-38371?
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-2021-38371?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST