Is CVE-2021-21781 in the CISA KEV catalog?

No. CVE-2021-21781 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21781?

CVE-2021-21781 has a CVSS v3 base score of 3.3 (LOW).

What is the EPSS score for CVE-2021-21781?

CVE-2021-21781 has an EPSS score of 0.53% (41th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21781?

Upgrade linux on debian 11 to 5.10.19-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-21781

LOW

3.3

CVSS v3

NVD

Description

An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11

CWE-908

How to fix

Remediation Available

linuxDebian

Fixed in:5.10.19-1CVE-2021-21781

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

0.53%probability of exploitation in 30 days

41stpercentile

Moderate risk: more likely to be exploited than 41% of all known CVEs.

References

Patch1

oracle.com

Exploit1

talosintelligence.com

Related Vulnerabilities

Other CWE-908 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2023-24941	Critical	9.8	95%	-	Fix
CVE-2007-1751	High	9.3	61%	-	-
CVE-2008-0081	Critical	9.8	58%	-	-
CVE-2020-1934	Medium	5.3	52%	-	Fix
CVE-2011-1255	High	9.3	42%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.