LiveActive security incident?Get immediate response
CVE Record

CVE-2021-32056: Cyrus IMAP before 3.2.7, and 3.3.x and 3.4.x before 3.4.1, allows remote authenticated users to bypass inte...

Cyrus IMAP before 3.2.7, and 3.3.x and 3.4.x before 3.4.1, allows remote authenticated users to bypass intended access restrictions on server annotations and consequently cause replication to stall.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-32056 affects Cyrus IMAP mail servers. A logged-in remote user could bypass intended controls on server annotations, which could cause replication to stall. This is mainly an operational availability and integrity-control concern for organizations running affected Cyrus IMAP versions, especially replicated mail infrastructure.

Executive priority

Schedule remediation in the normal vulnerability cycle, faster for replicated production mail systems. The issue is not documented as actively exploited, but it can affect mail service reliability and should not remain open on critical infrastructure.

Technical view

Cyrus IMAP before 3.2.7, and 3.3.x/3.4.x before 3.4.1, allowed remote authenticated users to bypass access restrictions on server annotations. The documented consequence is stalled replication. The source bundle provides no CVSS, CWE, proof-of-concept, or detailed root-cause data.

Likely exposure

Exposure is limited to environments running affected Cyrus IMAP versions. Risk is higher where authenticated users can reach the IMAP service and where mailbox replication is operationally important. The provided sources do not identify other products or downstream appliances as affected.

Exploitation context

The CVE description requires a remote authenticated user. The source bundle does not show CISA KEV listing, active exploitation, public exploit code, or exploitation at scale. Treat exploitation status as unconfirmed from the provided evidence.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit detail, or workaround is included in the bundle. The key technical facts are authenticated access, server annotation access-control bypass, and replication stall impact. Validate by version and vendor advisory alignment rather than attempting exploit reproduction.

Mitigation direction

  • Upgrade Cyrus IMAP to 3.2.7, 3.4.1, or a later supported fixed release.
  • Apply relevant Fedora package updates if using Fedora-maintained Cyrus IMAP packages.
  • Review Cyrus IMAP vendor release notes before choosing an upgrade path.
  • Prioritize replicated mail servers and externally reachable IMAP deployments.
  • Check vendor guidance for any configuration-specific mitigation details.

Validation and detection

  • Inventory Cyrus IMAP versions across mail servers.
  • Confirm no server runs versions before 3.2.7 or 3.4.1 in affected branches.
  • Check package manager history for Fedora advisory updates where applicable.
  • Review replication health after patching or upgrading.
  • Confirm authenticated user access paths to IMAP are understood and monitored.
Prepared
Confidence
medium
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CVE-2021-32056 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.