How severe is CVE-2020-21468?

CVE-2020-21468 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-21468 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-21468?

CVE-2020-21468 affects Redislabs Redis. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-21468?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-21468 published?

CVE-2020-21468 was published on 2021-09-20 and last updated on 2026-07-05.

CVE-2020-21468

CVE-2020-21468 is a high-severity vulnerability in Redislabs Redis with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Redislabs Redis
Published: 2021-09-20
Last modified: 2026-07-05

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2020-21468?: CVE-2020-21468 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-21468 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-21468?: CVE-2020-21468 affects Redislabs Redis. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-21468?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-21468 published?: CVE-2020-21468 was published on 2021-09-20 and last updated on 2026-07-05.

References

Affected products (1)

cpe:2.3:a:redislabs:redis:5.0.7:*:*:*:*:*:*:*

More vulnerabilities in Redislabs Redis

CVE-2015-4335 — Critical (CVSS 10.0): Redis before 2.8.21 and 3.x before 3.0.2 allows remote attackers to execute arbitrary Lua bytecode via the eval command.
CVE-2018-11219 — Critical (CVSS 9.8): An Integer Overflow issue was discovered in the struct library in the Lua subsystem in Redis before 3.2.12, 4.x before…
CVE-2018-11218 — Critical (CVSS 9.8): Memory Corruption was discovered in the cmsgpack library in the Lua subsystem in Redis before 3.2.12, 4.x before…
CVE-2017-15047 — Critical (CVSS 9.8): The clusterLoadConfig function in cluster.c in Redis 4.0.2 allows attackers to cause a denial of service (out-of-bounds…
CVE-2016-8339 — Critical (CVSS 9.8): A buffer overflow in Redis 3.2.x prior to 3.2.4 causes arbitrary code execution when a crafted command is sent. An out…
CVE-2018-12326 — High (CVSS 8.4): Buffer overflow in redis-cli of Redis before 4.0.10 and 5.x before 5.0 RC3 allows an attacker to achieve code execution…

All CVEs affecting Redislabs Redis →