CVE-2020-8138
MEDIUMCVSS 6.5/10EPSS 1.40%
Last modified
CVE-2020-8138 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.40% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | < 15.0.14 |
| Nextcloud | Nextcloud Server | >= 16.0.0, < 16.0.7 |
| Nextcloud | Nextcloud Server | >= 17.0.0, < 17.0.2 |
References
- https://hackerone.com/reports/736867Exploit, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-014Third Party Advisory
- https://hackerone.com/reports/736867Exploit, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=NC-SA-2020-014Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2020-8138?
CVE-2020-8138 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.40% probability of exploitation in the next 30 days.
How do I fix CVE-2020-8138?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2020-8138?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST