Security readout for executives and security teams
Plain-English summary
Alpine email client versions before 2.25 may trust certain IMAP server messages before the connection is protected by STARTTLS. In practical terms, a hostile or intercepted mail server connection could influence what the client accepts before encryption starts, creating confidentiality and integrity risk for email users.
Executive priority
Treat this as a targeted email-client hardening issue, not an internet-wide emergency. Prioritize users who rely on Alpine for business email, travel frequently, or connect over untrusted networks.
Technical view
CVE-2021-38370 is a STARTTLS state-handling issue in Alpine before 2.25. The client accepts untagged IMAP responses before STARTTLS completes. The source bundle does not provide CVSS, CWE, exploit details, or broader affected product mapping beyond Alpine before 2.25.
Likely exposure
Exposure is likely limited to users running Alpine email client before 2.25 with IMAP accounts using STARTTLS, especially on untrusted networks or against compromised/malicious IMAP infrastructure.
Exploitation context
The sources do not show CISA KEV listing or confirmed active exploitation. The plausible risk is pre-TLS IMAP response manipulation, but the bundle does not provide exploit prevalence, proof-of-concept status, or attack requirements in detail.
Researcher notes
Evidence is sparse in the provided bundle. Key facts are the affected version boundary, the IMAP STARTTLS pre-encryption response handling issue, and Gentoo advisory coverage. No CVSS, CWE, exploit-in-the-wild confirmation, or detailed patch notes were provided.
Mitigation direction
- Upgrade Alpine email client to version 2.25 or later where available.
- Apply Gentoo GLSA-202301-07 guidance if using Gentoo packages.
- Prefer fully TLS-protected IMAP configurations where supported by your mail provider.
- Check vendor and distribution advisories for backported package fixes.
Validation and detection
- Inventory endpoints and servers for Alpine email client versions before 2.25.
- Review mail client configurations for IMAP accounts using STARTTLS.
- Confirm package source advisories show the installed build contains the fix.
- Validate upgraded clients still connect successfully to required IMAP servers.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-38370 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://nostarttls.secvuln.info/CVE reference
- https://alpine.x10host.com/CVE reference
- https://bugs.gentoo.org/807613#c4CVE reference
- GLSA-202301-07CVE reference · vendor-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.