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 user-provided objects in MemCacheStore and RedisCacheStore potentially resulting in an RCE.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 45.7%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 45.73% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-502
- Affected
- rubyonrails/rails · debian/debian linux · opensuse/leap
- Source
- support@hackerone.com
EPSS 45.7% since 3 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.