CVE-2020-37248Disclosure

LOWCVSS 6.5 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS/man-in-the-middle attacks, taking over the connection and extracting account credentials in cleartext.

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0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-348

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.openwall.com/lists/oss-security/2026/06/08/3

Full discourse1 post

Open Source Security mailing list@oss_security137d
Disclosure
CVE-2020-37248: OfflineIMAP: STARTTLS stripping https://www.openwall.com/lists/oss-security/2026/06/08/3 OfflineIMAP before 8.0.3 trusts the server with their STARTTLS capability prior to authentication, which allows STRIPTLS MITM attacks taking over the connection and extracting account credentials in cleartext
Post summary
The text discloses that CVE-2020-37248 affects OfflineIMAP versions prior to 8.0.3, allowing an attacker to strip STARTTLS and intercept credentials via a MITM attack.
00030248
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