CVE-2015-3246
Actively exploited. CVE-2015-3246 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-08-26) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2015-3246 is indexed in Metasploit and Exploit-DB. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
CISA has added six new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2015-3246 Red Hat Libuser Race Condition Vulnerability CVE-2015-5287 Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability CVE-2019-1068 Microsoft SQL Server Remote Code Execution Vulnerability CVE-2021-23758 Ajax.NET Professional Deserialization of Untrusted Data Vulnerability CVE-2022-0995 Linux Kernel Out-of-Bounds Write Vulnerability CVE-2026-8452 Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA’s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied. While BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities . CISA will continue to add vulnerabilities to the catalog that meet the specified criteria . Aware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA’s KEV Nomination Form . Potential KEV additions must have a CVE ID, evidence of
CSIRTS triage
- What
- Six vulnerabilities across multiple vendors added to CISA's Known Exploited Vulnerabilities catalog.
- Who is affected
- Deployments running Red Hat Libuser, Red Hat ABRT, Microsoft SQL Server, Ajax.NET Professional, Linux Kernel, and Citrix NetScaler ADC/Gateway.
- Urgency
- Critical; all six are actively exploited and represent high risk to federal and enterprise networks.
- Action
- Refer to individual CVE advisories and apply available patches for each affected product.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 94% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2015-3246 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
- Exploit-DBA public exploit is published in the Exploit-DB archive.look it up ↗
Advisory coverage (2)
- highexploitedCISA Adds Six Known Exploited Vulnerabilities to Catalogcisa · 2026-08-26
- criticalexploitedCVE-2015-3246: Red Hat Libuser Race Condition Vulnerabilitycisa-kev · 2026-08-26
External references
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[](https://www.csirts.com/cve/CVE-2015-3246)