CVE-2023-26432

MEDIUM
4.3
CVSS Score
Published: June 20, 2023 at 07:51 AM UTC
Updated: June 17, 2026 at 05:43 AM UTC
2 products affected across 2 vendorsOpen Xchange Appsuite BackendOX App Suite

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Severity
MEDIUM4.3
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

When adding an external mail account, processing of SMTP "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue SMTP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted SMTP server response to reasonable length/size. No publicly available exploits are known.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 7.10.68.0.0 ≤ v < 8.11.07.10.67.10.6 revision_39
Affected range stops below 7.10.6, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.11.0, so it looks safe — our inference, not a vendor statement
v ≤ 7.10.6-rev39v ≤ 8.10

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMOX
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-400NVD-CWE-noinfo

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