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Security advisory

Type: advisorySources: OSVCVE: CVE-2020-14954

Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-14954
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 09:05 UTC · Revision 1

Source evidence

CVE-2020-14954

core-osv · Original source

Published 21 Jun 2020, 17:15 UTC

Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a "begin TLS" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka "response injection."

osv:CVE-2020-14954
Complete source record
{
  "id": "9785ab032c8bd6ae638db4c434ad08f29cfe7826ba1a7113c102d1c0a0e0ccdd",
  "url": "https://osv.dev/vulnerability/CVE-2020-14954",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-14954",
    "summary": "Mutt before 1.14.4 and NeoMutt before 2020-06-19 have a STARTTLS buffering issue that affects IMAP, SMTP, and POP3. When a server sends a \"begin TLS\" response, the client reads additional data (e.g., from a man-in-the-middle attacker) and evaluates it in a TLS context, aka \"response injection.\"",
    "evidence": "osv:CVE-2020-14954",
    "products": [],
    "severity": "medium",
    "structured": {
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      "aliases": [
        "CVE-2020-14954"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
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      "references": [
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