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CVE-2020-8165
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…
Critical9.8EPSS 45.7%
- Published
- Updated
- Reserved
- Assigned by
- hackerone
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.
Timeline
ID reserved
By hackerone
- 5 months later
· 5 months later
Published
- 5 years later
· 5 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 45.7% · top 1.2% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
https://github.com/rails/rails
- affected Fixed in 5.2.4.3, 6.0.3.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- RubyGemsactivesupportGHSA-2p68-f74v-9wc6 (opens in a new tab)
References (9)
- https://hackerone.com/reports/413388 (opens in a new tab)x_refsource_MISCx_transferred
- https://groups.google.com/g/rubyonrails-security/c/bv6fW4S0Y1c (opens in a new tab)x_refsource_MISCx_transferred
- [debian-lts-announce] 20200619 [SECURITY] [DLA 2251-1] rails security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- https://weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- [debian-lts-announce] 20200720 [SECURITY] [DLA 2282-1] rails security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- DSA-4766 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- openSUSE-SU-2020:1677 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- openSUSE-SU-2020:1679 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- https://security.netapp.com/advisory/ntap-20250509-0002/ (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-2p68-f74v-9wc6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2020-8165)Record last updated .