SSRF in Nextcloud Server

CVE-2020-8138

A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.

Vulnerability class: SSRF (Server-Side Request Forgery)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.014 (71.3th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-8138: held from 0.014 to 0.014.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

  • Nextcloud Server
  • Nextcloud Server — versions Fixed in 17.0.2, 16.0.7, and 15.0.14

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2020-8138?
CVE-2020-8138 is a medium-severity vulnerability in Nextcloud Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2020-03-20.
How severe is CVE-2020-8138?
Medium severity. CVSS v3 base score is 6.5 out of 10.