Is CVE-2023-1521 in the CISA KEV catalog?

No. CVE-2023-1521 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-1521?

CVE-2023-1521 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2023-1521?

CVE-2023-1521 has an EPSS score of 0.36% (28th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-1521?

Upgrade sccache on debian 13 to 0.5.3-1 or later.

CVE & CISA-KEV Catalog

CVE-2023-1521

HIGH

7.8

CVSS v3

NVD

Description

On Linux the sccache client can execute arbitrary code with the privileges of a local sccache server, by preloading the code in a shared library passed to LD_PRELOAD. If the server is run as root (which is the default when installing the snap package https://snapcraft.io/sccache ), this means a user running the sccache client can get root privileges.

CWE-426

How to fix

Remediation Available

sccacheDebian

Fixed in:0.5.3-1CVE-2023-1521

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

0.36%probability of exploitation in 30 days

28thpercentile

Low risk: more likely to be exploited than 28% of all known CVEs.

References

Exploit1

securitylab.github.com

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-426 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-0096	High	9.3	71%	-	-
CVE-2016-10009	High	7.3	37%	-	Fix
CVE-2016-0016	High	7.8	31%	-	-
CVE-2012-1854	High	7.8	21%	KEV	-
CVE-2018-12589	High	7.8	20%	-	-
CVE-2022-22047	High	7.8	19%	KEV	Fix

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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 2025-10-15.