CVE-2020-8165

Name: CVE-2020-8165
Creator: NVD / NIST
Published: 2020-06-19T18:15:11.067+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 45.73%

Last modified Jun 17, 2026

CVE-2020-8165 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A deserialization of untrusted data vulnernerability exists in rails < 5.2.4.3, rails < 6.0.3.1 that can allow an attacker to unmarshal user-provided objects in MemCacheStore and RedisCacheStore potentially resulting in an RCE.. EPSS estimates a 45.73% chance of exploitation in the next 30 days.

Description

A deserialization of untrusted data vulnernerability exists in rails < 5.2.4.3, rails < 6.0.3.1 that can allow an attacker to unmarshal user-provided objects in MemCacheStore and RedisCacheStore potentially resulting in an RCE.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

45.73%

98.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Rubyonrails	Rails	< 5.2.4.3
Rubyonrails	Rails	>= 6.0.0, < 6.0.3.1
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0
Opensuse	Leap	15.1
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00031.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00034.htmlMailing List, Third Party Advisory
https://groups.google.com/g/rubyonrails-security/c/bv6fW4S0Y1cMailing List, Patch, Third Party Advisory
https://hackerone.com/reports/413388Exploit, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00022.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00013.htmlMailing List, Third Party Advisory
https://weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released/Vendor Advisory
https://www.debian.org/security/2020/dsa-4766Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00031.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00034.htmlMailing List, Third Party Advisory
https://groups.google.com/g/rubyonrails-security/c/bv6fW4S0Y1cMailing List, Patch, Third Party Advisory
https://hackerone.com/reports/413388Exploit, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00022.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00013.htmlMailing List, Third Party Advisory
https://security.netapp.com/advisory/ntap-20250509-0002/
https://weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released/Vendor Advisory
https://www.debian.org/security/2020/dsa-4766Third Party Advisory

Timeline

Published: Jun 19, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8165?

How severe is CVE-2020-8165?

CVE-2020-8165 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 45.73% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8165?

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-2020-8165?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST