CVE-2020-21468

A segmentation fault in the redis-server component of Redis 5.0.7 leads to a denial of service (DOS). NOTE: the vendor cannot reproduce this issue in a released version, such as 5.0.7

Published: 2021-09-20 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-21468 is rated Moderate Risk (53.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.21%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-21468

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.50% 1.21% +0.71%
2 2025-12-28 0.38% 0.50% +0.11%
3 2025-12-27 — 0.38% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-21468

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-21468

OS Trackers for CVE-2020-21468

vendor priority summary link
debian unimportant CVE-2020-21468 unimportant priority: Debian including 1 source packages (redis), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2020-21468
redhat medium — https://access.redhat.com/security/cve/CVE-2020-21468
suse high CVE-2020-21468 severity important: SUSE including 1 source package names (redis), 1 product×package rows across 1 product lines (SUSE Linux Enterprise Module for Server Applications 15 SP2): Known Not Affected 1. https://www.suse.com/security/cve/CVE-2020-21468/
ubuntu negligible CVE-2020-21468 negligible priority: Ubuntu including 1 source packages (redis), 12 status rows across 12 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, trusty, upstream, xenial): not-affected 6, ignored 5, released 1. https://ubuntu.com/security/CVE-2020-21468

Affected software / configurations for CVE-2020-21468

Vendor Product Version Raw CPE
redislabs redis 5.0.7 cpe:2.3:a:redislabs:redis:5.0.7:*:*:*:*:*:*:*

References for CVE-2020-21468

URL Tags
http://redis.com Vendor Advisory
https://github.com/antirez/redis/issues/6633 Issue Tracking Third Party Advisory
cvelogic Threat Intelligence