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Security advisory

Type: advisorySources: OSVCVE: CVE-2021-38084

An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2021-38084
Confirmed fixed CVEs
Not specified
Updated in this feed
1 Nov 2026, 04:23 UTC · Revision 1

Source evidence

CVE-2021-38084

core-osv · Original source

Published 3 Aug 2021, 22:15 UTC

An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.

osv:CVE-2021-38084
Complete source record
{
  "id": "595ddd841b9d99a80d92d6d2214d864836de4883dc314c3ce1d668a1cc0cec10",
  "url": "https://osv.dev/vulnerability/CVE-2021-38084",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-38084",
    "summary": "An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.",
    "evidence": "osv:CVE-2021-38084",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-38084",
      "aliases": [
        "CVE-2021-38084"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/svarshavchik/courier",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "368f9fb227b46406643b9425db604a0594f71dfe"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:courier-mta:courier_mail_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.1.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "courier/1.1.4/20210518212001",
            "courier/1.1.3/20210424125125",
            "courier-imap/5.1.3/20210424125018",
            "courier-authlib/0.71.3/20210412205815",
            "courier/1.1.2/20210326200147",
            "courier/1.1.1/20210320170424",
            "courier-imap/5.1.2/20210326200013",
            "courier-imap/5.1.1/20210320170246",
            "sysconftool/0.18/20210319214332",
            "sqwebmail/6.0.6/20210319214818",
            "maildrop/3.0.3/20210319214705",
            "courier/1.1.0/20210319215318",
            "courier-imap/5.1.0/20210319215058",
            "courier-authlib/0.71.2/20210319214948",
            "courier-analog/0.19/20210319214401",
            "cone/1.2/20210319214458",
            "sqwebmail/6.0.5/20210209210407",
            "courier/1.0.15/20210209205145",
            "courier-imap/5.0.12/20210209210152",
            "courier-authlib/0.71.1/20210209205029",
            "maildrop/3.0.2/20210209215800",
            "courier-sox/0.15/20210209215744",
            "cone/1.1/20201026193655",
            "maildrop/3.0.1/20200618220426",
            "courier-sox/0.14/20200618215757",
            "courier/1.0.14/20200618210330",
            "courier-sox/0.13/20200616202004",
            "courier-imap/5.0.11/20200618210620",
            "courier-authlib/0.71.0/20200618210228",
            "courier/1.0.13/20200424072124",
            "courier/1.0.12/20200420082639",
            "courier/1.0.11/20200420073456",
            "courier-imap/5.0.10/20200420082513",
            "courier-imap/5.0.9/20200419173038",
            "courier/1.0.10/20200419171855",
            "courier-authlib/0.70.0/20200419164631",
            "sqwebmail/6.0.3/20190831135524",
            "courier/1.0.9/20190831140324",
            "courier-imap/5.0.8/20190831135704",
            "courier-authlib/0.69.1/20190724201053",
            "courier/1.0.8/20190608090758",
            "sqwebmail/6.0.2/20190608084438",
            "sqwebmail/6.0.1/20190608084158",
            "sqwebmail/6.0.1/20190330184554",
            "courier/1.0.7/20190608085611",
            "courier/1.0.7/20190330184047",
            "courier-imap/5.0.7/20190330184405",
            "courier/1.0.6/20190130192956",
            "courier-imap/5.0.6/20190130192542",
            "courier/1.0.5/20181217190604",
            "courier-imap/5.0.5/20181217190442",
            "courier/1.0.4/20181128192349",
            "courier-imap/5.0.4/20181128192207",
            "courier/1.0.3/20181117093143",
            "courier-imap/5.0.3/20181117093458",
            "courier/1.0.2/20181027103012",
            "courier-imap/5.0.2/20181027111303",
            "courier-imap/5.0.2/20181027111145",
            "courier/1.0.1/20181013160807",
            "courier-imap/5.0.1/20181013160554",
            "sqwebmail/6.0.0/20180917224034",
            "maildrop/3.0.0/20180917224237",
            "courier/1.0/20180917223614",
            "courier-imap/5.0.0/20180917223909",
            "courier-authlib/0.69.0/20180917223454",
            "cone/1.0/20180917224334",
            "sqwebmail/5.9.2/20171203115438",
            "maildrop/2.9.3/20171203115314",
            "courier/0.78.2/20171203115636",
            "cone/0.96.2/20171203115147",
            "maildrop/2.9.2/20171005081210",
            "sqwebmail/5.9.1/20171004194032",
            "maildrop/2.9.1/20171004194531",
            "courier/0.78.1/20171004193712",
            "courier-imap/4.18.2/20171004193929",
            "maildrop/2.9.1/20171005071202",
            "maildrop/2.9.1/20170819100311",
            "courier/0.78.0/20170819100405",
            "courier-imap/4.18.1/20170819100155",
            "cone/0.96.1/20170819100006",
            "sqwebmail/5.9.0/20170702105209",
            "maildrop/2.9.0/20170702105314",
            "courier/0.77.0/20170702104900",
            "courier-imap/4.18.0/20170702105051",
            "courier-authlib/0.68.0/20170702104809",
            "cone/0.96/20170702105408",
            "cone/0.95/20170305145100",
            "courier-authlib/0.67.0/20170128131141",
            "sqwebmail/5.8.4/20170117205036",
            "maildrop/2.8.5/20170117205233",
            "courier/0.76.4/20170117203707",
            "courier-imap/4.17.3/20170117204906",
            "courier/0.76.3/20160917211918",
            "maildrop/2.8.4/20160814100858",
            "courier/0.76.2/20160814100959",
            "courier-imap/4.17.2/20160814101108",
            "courier/0.76.2/20160814095637",
            "courier-imap/4.17.2/20160814095842",
            "cone/0.94/20160814095508",
            "courier-analog/0.17/20160602194744",
            "courier-analog/0.17/20160602194523",
            "courier-analog/0.17/20160602194412",
            "courier/0.76.1/20160508090929",
            "courier-imap/4.17.1/20160508091211",
            "courier/0.76.0/20160426065735",
            "courier-imap/4.17.0/20160426065621",
            "courier-authlib/0.66.4/20151115120442",
            "sqwebmail/5.8.3/20150628231305",
            "maildrop/2.8.3/20150628231513",
            "courier/0.75.0/20150628230151",
            "courier-imap/4.16.2/20150628230425",
            "courier-authlib/0.66.3/20150628230025",
            "sqwebmail/5.8.2/20150427083025",
            "maildrop/2.8.2/20150427083304",
            "courier/0.74.2/20150427082630",
            "courier/0.74.2/20150427082224",
            "courier-imap/4.16.1/20150427082912",
            "courier-authlib/0.66.2/20150427083605",
            "cone/0.92/20150427080758",
            "sqwebmail/5.8.1/20141214081101",
            "maildrop/2.8.1/20141214081550",
            "courier/0.74.1/20141214080824",
            "cone/0.91.1/20141214081718",
            "sqwebmail/5.8.0/20141213101603",
            "maildrop/2.8.0/20141213101719",
            "courier/0.74.0/20141213101233",
            "courier-imap/4.16.0/20141213101457",
            "cone/0.91/20141213104043",
            "sqwebmail/5.7.3/20140901092902",
            "maildrop/2.7.2/20140901092804",
            "courier/0.73.2/20140901093012",
            "courier-imap/4.15.1/20140901094658",
            "sqwebmail/5.7.2/20131223195015",
            "courier/0.73.1/20131223194809",
            "sqwebmail/5.7.1/20131128184237",
            "maildrop/2.7.1/20131128184356",
            "courier/0.73/20131128185623",
            "courier-imap/4.15/20131128184113",
            "courier-authlib/0.66.1/20131111193749",
            "courier-sox/0.12/20131006094016",
            "sqwebmail/5.7.0/20130928195718",
            "maildrop/2.7.0/20130928195403",
            "courier/0.72/20130928195848",
            "courier-imap/4.14/20130928195544",
            "courier-authlib/0.66.0/20130928223315",
            "sysconftool/0.17/20130825182318",
            "sysconftool/0.17/20130825180226"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38084.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:18.251007486Z",
      "provider": "osv",
      "references": [
        "https://sourceforge.net/p/courier/mailman/courier-imap/thread/cone.1382574216.483027.8082.1000%40monster.email-scan.com/#msg31555583",
        "https://sourceforge.net/p/courier/mailman/message/37329216/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-38084",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429732,
  "published_at": "2021-08-03T22:15:09.31+00:00"
}