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Open Xchange CVE-2021-28094

MEDIUM
Inadequate Encryption Strength (CWE-326)
2021-07-30 cve@mitre.org
Information Disclosure Open Xchange Open Xchange Documents
6.5
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-326
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Encryption strength requirements
Impact

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

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the medium-severity affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 1.1% exploitation probability (EPSS)

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AnalysisAI

OX Documents before 7.10.5-rev7 has Incorrect Access Control for converted documents because hash collisions can occur, due to use of CRC32. Rated medium severity (CVSS 6.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

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Technical ContextAI · show details

This vulnerability is classified under CWE-326. OX Documents before 7.10.5-rev7 has Incorrect Access Control for converted documents because hash collisions can occur, due to use of CRC32. Affected products include: Open-Xchange Open-Xchange Documents. Version information: before 7.10.5.

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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:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

DescriptionNVD

OX Documents before 7.10.5-rev7 has Incorrect Access Control for converted documents because hash collisions can occur, due to use of CRC32.

Threat Intelligence Overview

EPSS Score
1.1%
Top 38% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

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 1.1%
Patch available No
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
Yes
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

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)NVD

cpe:2.3:a:open-xchange:open-xchange_documents:*:*:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:-:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:revision1:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:revision2:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:revision3:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:revision4:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:revision5:*:*:*:*:*:*
cpe:2.3:a:open-xchange:open-xchange_documents:7.10.5:revision6:*:*:*:*:*:*

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Same weakness CWE-326 – Inadequate Encryption Strength

View all
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CVE-2021-42216 CRITICAL POC
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CVE-2017-8076 CRITICAL POC
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CVE-2017-7888 CRITICAL POC
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CVE-2018-25272 CRITICAL POC
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Same technique Information Disclosure

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CVE-2019-2725 CRITICAL POC
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CVE-2021-34523 CRITICAL POC
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CVE-2013-2251 CRITICAL POC
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CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
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CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

References

Advisories & patches
REF http://packetstormsecurity.com/files/163569/OX-Documents-7.10.5-Improper-Authorization.html REF http://seclists.org/fulldisclosure/2021/Jul/37 REF https://www.open-xchange.com

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