What is CVE-2022-40305?

CVE-2022-40305 is a critical-severity vulnerability in Canto, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2022-09-09.

How severe is CVE-2022-40305?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2022-40305 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

SSRF in Canto

CVE-2022-40305

A Server-Side Request Forgery issue in Canto Cumulus through 11.1.3 allows attackers to enumerate the internal network, overload network resources, and possibly have unspecified other impact via the server parameter to the /cwc/login login form.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published 2022-09-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.015 (74.1th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.015 · change: +0.003

Affected products

Canto

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

Public proof-of-concept exploits

References

www.syss.de/fileadmin/dokumente/Publikationen/Advisories/SYSS-2022-023.txt (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2022-40305?: CVE-2022-40305 is a critical-severity vulnerability in Canto, classified under Server-Side Request Forgery (SSRF). CVSS score: 9.8/10. Published 2022-09-09.
How severe is CVE-2022-40305?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2022-40305 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.