Is CVE-2017-12424 in the CISA KEV catalog?

No. CVE-2017-12424 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-12424?

CVE-2017-12424 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2017-12424?

CVE-2017-12424 has an EPSS score of 2.66% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-12424?

Upgrade shadow on debian 11 to 1:4.5-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2017-12424

CRITICALEPSS 84th pctl

9.8

CVSS v3

NVD

Description

In shadow before 4.5, the newusers tool could be made to manipulate internal data structures in ways unintended by the authors. Malformed input may lead to crashes (with a buffer overflow or other memory corruption) or other unspecified behaviors. This crosses a privilege boundary in, for example, certain web-hosting environments in which a Control Panel allows an unprivileged user account to create subaccounts.

CWE-119Buffer Overflow

How to fix

Remediation Available

shadowDebian

Fixed in:1:4.5-1CVE-2017-12424

loginUbuntu

Fixed in:1:4.1.5.1-1ubuntu9.5+esm1USN-5254-1

Fixed in:1:4.2-3.1ubuntu5.5+esm1USN-5254-1

Fixed in:1:4.5-1ubuntu2.2USN-5254-1

passwdUbuntu

Fixed in:1:4.1.5.1-1ubuntu9.5+esm1USN-5254-1

Fixed in:1:4.2-3.1ubuntu5.5+esm1USN-5254-1

Fixed in:1:4.5-1ubuntu2.2USN-5254-1

shadowUbuntu

Fixed in:1:4.1.5.1-1ubuntu9.5+esm1USN-5254-1

Fixed in:1:4.2-3.1ubuntu5.5+esm1USN-5254-1

Fixed in:1:4.5-1ubuntu2.2USN-5254-1

uidmapUbuntu

Fixed in:1:4.1.5.1-1ubuntu9.5+esm1USN-5254-1

Fixed in:1:4.2-3.1ubuntu5.5+esm1USN-5254-1

Fixed in:1:4.5-1ubuntu2.2USN-5254-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.66%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory4

Related Vulnerabilities

Other CWE-119 (Buffer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-4966	Critical	9.4	100%	KEV + Ransom	Fix
CVE-2017-11882	High	7.8	100%	KEV + Ransom	-
CVE-2020-0796	Critical	10.0	100%	KEV + Ransom	-
CVE-2008-4250	Critical	9.8	99%	KEV	-
CVE-2017-15944	Critical	9.8	98%	KEV	Fix
CVE-2015-0014	High	10.0	97%	-	-

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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 2026-05-13.