Resource exhaustion in Open-Xchange Appsuite Backend
CVE-2023-26432
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.011 (65.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000
Affected products
- Open-Xchange Appsuite Backend — versions 7.10.6
- Ox Software Gmbh App Suite — versions 0
Weakness classification (CWE)
References
- software.open-xchange.com/products/appsuite/doc/Release_Notes_for_Patch_Release… (release-notes, Release Notes)
- documentation.open-xchange.com/appsuite/security/advisories/csaf/2023/oxas-adv-… (vendor-advisory)
- seclists.org/fulldisclosure/2023/Jun/8 (Mailing List, Third Party Advisory)
- packetstormsecurity.com/files/173083/OX-App-Suite-SSRF-Resource-Consumption-Com… (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-26432?
- CVE-2023-26432 is a medium-severity vulnerability in Open-Xchange Appsuite Backend, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2023-06-20.
- How severe is CVE-2023-26432?
- Medium severity. CVSS v3 base score is 4.3 out of 10.