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Known exploited vulnerability

CVE-2015-3246

highCVSS 3.1 7.4In CISA KEVEPSS 8.5%Published · n/a

The short answer

CVE-2015-3246 affects n/a n/a and is rated high (CVSS 7.4). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-08-26: attackers are using it, so patch it first.

What it is

libuser before 0.56.13-8 and 0.60 before 0.60-7, as used in the userhelper program in the usermode package, directly modifies /etc/passwd, which allows local users to cause a denial of service (inconsistent file state) by causing an error during the modification. NOTE: this issue can be combined with CVE-2015-3245 to gain privileges.

Weakness: CWE-264, CWE-367.

Severity

7.4 high

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

Exploited (CISA KEV)

Yes, since Aug 26, 2026

Federal due date Sep 9, 2026

EPSS, next 30 days

8.5%

Higher than 95% of scored CVEs

How it can be exploited

Attack vector
Local
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

Affected products

n/a. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2015-3246 being exploited?

Yes. CISA added CVE-2015-3246 to its Known Exploited Vulnerabilities catalog on 2026-08-26, with a federal remediation due date of 2026-09-09.

How do I fix CVE-2015-3246?

CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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