CVE-2020-8165: debian debian_linux Deserialization of Untrusted Data
Vulnerability summary
CVE-2020-8165 is a critical (CVSS 9.8) Deserialization of Untrusted Data vulnerability in debian debian_linux. EPSS estimates a 45.73% chance of exploitation in the next 30 days, higher than 98.8% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 11 · Related 7Timeline
- 19-06-2020PublishedVulnerability first disclosed.
- 09-05-2025Last modifiedVulnerability information updated.
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 metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · RubygemsEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
45.73%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
No change 0.00 pp
From 45.73% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundExploit Reference (hackerone.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Suse6 products
- rubygem-activesupport-4_2&distro=SUSE OpenStack Cloud 7< 4.2.9-7.9.1
- rubygem-activesupport-4_2&distro=SUSE OpenStack Cloud Crowbar 8< 4.2.9-7.9.1
- rubygem-activesupport-4_2&distro=SUSE OpenStack Cloud Crowbar 9< 4.2.9-7.9.1
- rubygem-activesupport-5_1&distro=SUSE Linux Enterprise High Availability Extension 15< 5.1.4-3.3.1
- rubygem-activesupport-5_1&distro=SUSE Linux Enterprise High Availability Extension 15 SP1< 5.1.4-3.3.1
Opensuse3 products
- leapEOL15.1 | 15.2
- rubygem-activesupport-5_1&distro=openSUSE Leap 15.1< 5.1.4-lp151.3.3.1
- rubygem-activesupport-5_1&distro=openSUSE Leap 15.2< 5.1.4-lp152.4.3.1
Debian2 products
- rails< 2:5.2.4.3+dfsg-1
- debian_linuxEOL8.0 | 9.0 | 10.0
RubyGems1 product
- activesupport≥ 5.0.0, < 5.2.4.3 | ≥ 6.0.0, < 6.0.3.1
Rubyonrails1 product
- rails< 5.2.4.3 | ≥ 6.0.0, < 6.0.3.1
Ubuntu1 product
- railsAll versions (No fix recorded)
6 vendors · 14 products
References
25 links- groups.google.com/g/rubyonrails-security/c/bv6fW4S0Y1cX Refsource MISCWEBMailing ListPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2020/06/msg00022.htmlMailing ListX Refsource MLISTWEBThird Party Advisory- weblog.rubyonrails.org/2020/5/18/Rails-5-2-4-3-and-6-0-3-1-have-been-released/X Refsource CONFIRMVendor Advisory
- lists.debian.org/debian-lts-announce/2020/07/msg00013.htmlMailing ListX Refsource MLISTWEBThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00031.htmlVendor AdvisoryX Refsource SUSEWEBMailing ListThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2020-10/msg00034.htmlVendor AdvisoryX Refsource SUSEWEBMailing ListThird Party Advisory
Show all 25 references
- lists.opensuse.org/archives/…Advisory
- lists.opensuse.org/archives/…Advisory
