Vulnerability-Lookup

CVE-2021-33515 (GCVE-0-2021-33515)

Vulnerability from cvelistv5 – Published: 2021-06-28 12:04 – Updated: 2024-08-03 23:50

Summary

The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.

Severity

4.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2333 records in the last 180 days details

References

6 references

URL	Tags
https://dovecot.org/security	x_refsource_MISC
https://www.openwall.com/lists/oss-security/2021/…	x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202107-41	vendor-advisoryx_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2022…	mailing-listx_refsource_MLIST

Show details on NVD website

JSON

To clipboard

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OPENSUSE-SU-2025:14715-1

Vulnerability from csaf_opensuse - Published: 2025-01-30 00:00 - Updated: 2026-09-20 21:26

Summary

dovecot24-2.4.0-1.1 on GA media

Severity

Moderate

Scope

24 vulnerabilities in this advisory, including CVE-2021-33515.

CVE-2021-33515

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Recommended: 32 products

Open the full advisory

RHSA-2022:1950

Vulnerability from csaf_opensuse - Published: 2022-05-10 00:00 - Updated: 2026-09-20 11:20

Summary

security update for dovecot

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-33515.

CVE-2021-33515

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Recommended: 7 products

Open the full advisory

SUSE-SU-2021:2122-1

Vulnerability from csaf_suse - Published: 2021-06-22 12:13 - Updated: 2026-09-20 13:59

Summary

Security update for dovecot23

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2021-33515.

CVE-2021-33515

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Recommended: 162 products

Open the full advisory

SUSE-SU-2021:2123-1

Vulnerability from csaf_suse - Published: 2021-06-22 12:29 - Updated: 2026-09-20 14:00

Summary

Security update for dovecot23

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2021-33515.

CVE-2021-33515

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Recommended: 576 products

Open the full advisory

SUSE-SU-2021:2124-1

Vulnerability from csaf_suse - Published: 2021-06-22 12:30 - Updated: 2026-09-20 14:00

Summary

Security update for dovecot23

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2021-33515.

CVE-2021-33515

4.2 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Recommended: 234 products

Open the full advisory

UBUNTU-CVE-2021-33515 (CVE-2021-33515)

Vulnerability from osv_ubuntu – Published: 2021-06-21 12:00 – Updated: 2026-04-22 07:40 – Source website

Details

The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.

Severity

4.8 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-33515	REPORT
	https://dovecot.org/pipermail/dovecot-news/2021-J…	REPORT
	https://dovecot.org/pipermail/dovecot-news/2021-J…	REPORT
	https://ubuntu.com/security/notices/USN-4993-1	ADVISORY
	https://www.cve.org/CVERecord?id=CVE-2021-33515	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-lucene",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
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          {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          },
          {
            "binary_name": "mail-stack-delivery",
            "binary_version": "1:2.3.7.2-1ubuntu3.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "dovecot",
        "purl": "pkg:deb/ubuntu/dovecot@1:2.3.7.2-1ubuntu3.4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:2.3.7.2-1ubuntu3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:2.3.4.1-5ubuntu3",
        "1:2.3.7.2-1ubuntu1",
        "1:2.3.7.2-1ubuntu2",
        "1:2.3.7.2-1ubuntu3",
        "1:2.3.7.2-1ubuntu3.1",
        "1:2.3.7.2-1ubuntu3.2",
        "1:2.3.7.2-1ubuntu3.3"
      ]
    }
  ],
  "aliases": [],
  "details": "The submission service in Dovecot before 2.3.15 allows STARTTLS command injection in lib-smtp. Sensitive information can be redirected to an attacker-controlled address.",
  "id": "UBUNTU-CVE-2021-33515",
  "modified": "2026-04-22T07:40:04Z",
  "published": "2021-06-21T12:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33515"
    },
    {
      "type": "REPORT",
      "url": "https://dovecot.org/pipermail/dovecot-news/2021-June/000457.html"
    },
    {
      "type": "REPORT",
      "url": "https://dovecot.org/pipermail/dovecot-news/2021-June/000459.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4993-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-33515"
    }
  ],
  "related": [
    "USN-4993-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-33515"
  ]
}

WID-SEC-W-2022-1536

Vulnerability from csaf_certbund - Published: 2021-06-21 22:00 - Updated: 2025-02-02 23:00

Summary

Dovecot: Mehrere Schwachstellen

Severity

Mittel

Scope

3 vulnerabilities in this advisory, including CVE-2021-33515.

CVE-2021-33515

Es existiert eine Schwachstelle in Dovecot. Die Schwachstelle besteht darin, dass ein Angreifer der sich im gleichen Pfad befindet Befehle vor dem "StartTLS"-Befehl senden kann, welche dann nach der Ausführung des "StartTLS"-Befehls ausgeführt werden. Die Folge ist die Offenlegung von informationen, z.B. Anmeldedaten. Ein entfernter, authentisierter Angreifer kann diese Schwachstelle ausnutzen, um Informationen offenzulegen.

Known affected: 6 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2021-33515 (GCVE-0-2021-33515)

OPENSUSE-SU-2025:14715-1

RHSA-2022:1950

SUSE-SU-2021:2122-1

SUSE-SU-2021:2123-1

SUSE-SU-2021:2124-1

UBUNTU-CVE-2021-33515 (CVE-2021-33515)

WID-SEC-W-2022-1536

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Vulnerability timeline

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