Is CVE-2021-23240 in the CISA KEV catalog?

No. CVE-2021-23240 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23240?

CVE-2021-23240 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-23240?

CVE-2021-23240 has an EPSS score of 1.07% (61th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23240?

Upgrade sudo on debian 11 to 1.9.5-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-23240

HIGH

7.8

CVSS v3

NVD

Description

selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.

CWE-59Link Following

How to fix

Remediation Available

sudoDebian

Fixed in:1.9.5-1CVE-2021-23240

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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.07%probability of exploitation in 30 days

61stpercentile

Moderate risk: more likely to be exploited than 61% of all known CVEs.

References

Patch1

bugzilla.suse.com

Vendor Advisory1

sudo.ws

Third-Party Advisory2

Other references4

Related Vulnerabilities

Other CWE-59 (Link Following) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-30333	High	7.5	99%	KEV + Ransom	Fix
CVE-2021-21300	High	8.0	89%	-	Fix
CVE-2021-32610	High	7.1	73%	-	Fix
CVE-2020-36193	High	7.5	71%	KEV	Fix
CVE-2023-40028	Medium	4.9	58%	-	Fix
CVE-2020-0787	High	7.8	43%	KEV + Ransom	-

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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.