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Fencer Vulns
high 7.5

CVE-2020-21468 json

A segmentation fault in the redis-server component of Redis 5.0.7 leads to a denial of service (DOS).

published 2021-09-20 5 y ago modified 2026-07-09 4 mo ago also EUVD-2020-14240

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 68%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-21468 updated cvss 7.5

redis: Segmentation fault in the redis-server component

  • Red Hat 3scale API Management Platform 2 redis Red Hat Advanced Cluster Management for Kubernetes 2 redis Red Hat Ansible Automation Platform 1.2 redis Red Hat Ansible Tower 3 redis Red Hat Enterprise Linux 8 redis Red Hat Enterprise Linux 9 redis
    +3 more products
    Red Hat OpenStack Platform 10 (Newton) redis Red Hat OpenStack Platform 13 (Queens) redis Red Hat Software Collections rh-redis5-redis, rh-redis6-redis
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.20% chance of exploitation in the next 30 days, higher than 68% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.