What’s Vulnerable › Vulnerabilities
CVE-2023-26432
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-06-20 · updated 2026-06-17
- Weakness: CWE-400
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 products
- Open-Xchange Appsuite Backend: before 7.10.6; from 8.0.0 before 8.11.0; 7.10.6, 7.10.6-revision_39 — fixed in 7.10.6, 8.11.0
How to fix
Upgrade to a fixed version: Open-Xchange Appsuite Backend 7.10.6, 8.11.0. Check the vendor advisory for mitigations.
References
- http://packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html
- http://seclists.org/fulldisclosure/2023/Jun/8
- https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
- https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf
- http://packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Command-Injection.html
- http://seclists.org/fulldisclosure/2023/Jun/8
- https://documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-2023-0002.json
- https://software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release_6219_7.10.6_2023-03-20.pdf
Get alerted when CVE-2023-26432 or the next vulnerability affects your stack