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Cyrus Imap CVE-2024-34055

MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2024-06-05 cve@mitre.org
Denial Of Service Cyrus Imap Cyrusimap
6.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-770
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource allocation limits
MITRE ATT&CK

1 technique across 1 tactic: Impact

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 6.5 (MEDIUM). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived

A remote attacker could exhaust system resources through uncontrolled allocation by sending crafted requests to the affected application.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.8% exploitation probability (EPSS)

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AnalysisAI

Cyrus IMAP before 3.8.3 and 3.10.x before 3.10.0-rc1 allows authenticated attackers to cause unbounded memory allocation by sending many LITERALs in a single command. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, low attack complexity. This Allocation of Resources Without Limits vulnerability could allow attackers to exhaust system resources through uncontrolled allocation.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Set resource limits, implement rate limiting, validate input sizes.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Allocation of Resources Without Limits (CWE-770), which allows attackers to exhaust system resources through uncontrolled allocation. Cyrus IMAP before 3.8.3 and 3.10.x before 3.10.0-rc1 allows authenticated attackers to cause unbounded memory allocation by sending many LITERALs in a single command. Affected products include: Cyrusimap Cyrus Imap. Version information: before 3.8.3.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

DescriptionNVD

Cyrus IMAP before 3.8.3 and 3.10.x before 3.10.0-rc1 allows authenticated attackers to cause unbounded memory allocation by sending many LITERALs in a single command.

Threat Intelligence Overview

EPSS Score
0.8%
Top 47% exploitable
Data Quality
3 sources
Confidence: Low
NVD CVE.org EPSS GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.8%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

33
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +32
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:a:cyrusimap:cyrus_imap:*:*:*:*:*:*:*:*
cpe:2.3:a:cyrusimap:cyrus_imap:3.10.0:alpha0:*:*:*:*:*:*
cpe:2.3:a:cyrusimap:cyrus_imap:3.10.0:beta1:*:*:*:*:*:*
cpe:2.3:a:cyrusimap:cyrus_imap:3.10.0:beta2:*:*:*:*:*:*

More in Cyrus Imap

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CVE-2017-12843 MEDIUM
6.5 Aug 22

Cyrus IMAP before 3.0.3 allows remote authenticated users to write to arbitrary files via a crafted (1) SYNCAPPLY, (2) S
CVE-2026-47084 MEDIUM
6.5 Jul 16

Unauthorized mailbox deletion in Cyrus IMAP through 3.12.2 allows any authenticated non-admin user to invoke the admin-o
CVE-2026-47082 MEDIUM
5.4 Jul 16

Incorrect authorization in Cyrus IMAP through 3.12.2 allows authenticated users to bypass mailbox ACL enforcement via th
CVE-2026-47083 MEDIUM
4.3 Jul 16

Cross-user information disclosure in Cyrus IMAP through 3.12.2 allows any authenticated IMAP user to enumerate folder na
CVE-2026-47089 MEDIUM
4.3 Jul 16

Cyrus IMAP through 3.12.2 exposes mailbox ACL data to any authenticated user via the IMAP LISTRIGHTS command, which lack
CVE-2026-47085 MEDIUM
4.0 Jul 16

URLAUTH token forgery in Cyrus IMAP through 3.12.2 allows a network-based unauthenticated attacker to read the contents

CVE-2026-47087 LOW
3.5 Jul 16

Cyrus IMAP through version 3.12.2 fails to invalidate URLAUTH-minted URLs when the authorizer's access is subsequently r
CVE-2026-47086 LOW
3.5 Jul 16

Unauthorized mailbox access in Cyrus IMAP through 3.12.2 allows any authenticated user to read email from mailboxes they
CVE-2026-47088 LOW
3.1 Jul 16

Heap over-read in Cyrus IMAP through version 3.12.2 enables authenticated IMAP users to leak server heap memory by submi
CVE-2026-47081 LOW
3.1 Jul 16

Cyrus IMAP through version 3.12.2 contains an authorization flaw in its XAPPLEPUSHSERVICE (XAPS) command that lets authe

Same weakness CWE-770 – Allocation of Resources Without Limits or Throttling

View all
CVE-2017-8779 HIGH POC
7.5
CVE-2025-53521 CRITICAL POC
9.3
CVE-2024-28182 MEDIUM
5.3
CVE-2023-2650 MEDIUM
6.5
CVE-2017-5850 HIGH POC
7.5
CVE-2025-26682 HIGH
7.5
CVE-2022-32206 MEDIUM POC
6.5
CVE-2023-24998 HIGH
7.5

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

References

Advisories & patches
PATCH https://github.com/cyrusimap/cyrus-imapd/commit/ef9e4e8314d6a06f2269af0ccf606894cc3fe489 REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CJZQAE3XC2GBCE5KSTWJ5A6QYANFWGFB/ REF https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WVZHUZDU4MGTTZJRNACTMSKXLNMMRLJ6/ REF https://www.cyrusimap.org/dev/imap/download/release-notes/3.10/x/3.10.0-rc1.html REF https://www.cyrusimap.org/imap/download/release-notes/3.8/x/3.8.3.html

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