How severe is CVE-2023-1521?

CVE-2023-1521 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-1521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-1521?

CVE-2023-1521 affects Mozilla Sccache. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-1521?

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.

Does CVE-2023-1521 have an EU (EUVD) identifier?

Yes. CVE-2023-1521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-1648.

When was CVE-2023-1521 published?

CVE-2023-1521 was published on 2024-11-26 and last updated on 2026-06-17.

CVE-2023-1521

CVE-2023-1521 is a high-severity vulnerability in Mozilla Sccache with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-426.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-1648
Weakness: CWE-426
Affected product: Mozilla Sccache
Published: 2024-11-26
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-1521?: 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.
How severe is CVE-2023-1521?: CVE-2023-1521 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-1521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-1521?: CVE-2023-1521 affects Mozilla Sccache. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-1521?: 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.
Does CVE-2023-1521 have an EU (EUVD) identifier?: Yes. CVE-2023-1521 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-1648.
When was CVE-2023-1521 published?: CVE-2023-1521 was published on 2024-11-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mozilla:sccache:*:*:*:*:*:rust:*:*

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