--- title: "CVE-2013-3660: The EPATHOBJ::pprFlattenRec function… | CubePath" description: "The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista…" language: en source: https://cubepath.com/security/cve/CVE-2013-3660 --- # CVE-2013-3660: The EPATHOBJ::pprFlattenRec function… | CubePath ## Description The EPATHOBJ::pprFlattenRec function in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, and Windows Server 2012 does not properly initialize a pointer for the next object in a certain list, which allows local users to obtain write access to the PATHRECORD chain, and consequently gain privileges, by triggering excessive consumption of paged memory and then making many FlattenPath function calls, aka "Win32k Read AV Vulnerability." Official description from the CVE record, published by mitre. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2013-3660) ## Key data ### CVSS 3.1 High 7.8 Score published by CISA-ADP in the CVE record. CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H | Metric | Value | What it means | | ---------------------- | --------- | ----------------------------------------------------------------------------------------- | | Attack vector | Local | The attacker needs local access to the system, or to trick a user into running something. | | Attack complexity | Low | No special conditions are needed. The attack can be repeated at will. | | Privileges required | None | No account or privileges are needed. | | User interaction | Required | A user has to do something first, such as opening a file or following a link. | | Scope | Unchanged | The impact stays within the vulnerable component. | | Confidentiality impact | High | Serious or total effect on the secrecy of data. | | Integrity impact | High | Serious or total effect on the trustworthiness of data. | | Availability impact | High | Serious or total effect on availability. | CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) . ### EPSS Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days. Score 0.39318 (39.3% probability) Percentile 98.6% Scores of Nov 10, 2026 Model v2026.06.15 ### CISA Known Exploited Vulnerabilities This CVE is listed in the CISA KEV catalog. Name in the catalog Microsoft Win32k Privilege Escalation Vulnerability Added to the catalog Mar 28, 2022 Federal due date Apr 18, 2022 ### CISA assessment as of Feb 7, 2025 Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA. Exploitation Recorded by CISA as active Automatable no Technical impact total ### Weakness (CWE) CWE catalog version 5.0. CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license. - [CWE-119](https://cwe.mitre.org/data/definitions/119.html) Improper Restriction of Operations within the Bounds of a Memory Buffer ## References Links listed in the CVE record. They lead to other sites, which CubePath does not control. - [20130517 Re: exploitation ideas under memory pressure](http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0094.html) (archives.neohapsis.com) mailing-list - [25611](http://www.exploit-db.com/exploits/25611/) (exploit-db.com) exploit - [20130517 exploitation ideas under memory pressure](http://archives.neohapsis.com/archives/fulldisclosure/2013-05/0090.html) (archives.neohapsis.com) mailing-list - [53435](http://secunia.com/advisories/53435) (secunia.com) third-party-advisory - [93539](http://www.osvdb.org/93539) (osvdb.org) vdb-entry - [twitter.com/taviso/statuses/309157606247768064](http://twitter.com/taviso/statuses/309157606247768064) - [computerworld.com/s/article/9239477](http://www.computerworld.com/s/article/9239477) - [theverge.com/2013/5/23/4358400/google-engineer-bashes-micro…](http://www.theverge.com/2013/5/23/4358400/google-engineer-bashes-microsoft-discloses-windows-flaw) - [oval:org.mitre.oval:def:17360](https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17360) (oval.cisecurity.org) vdb-entry signature - [reddit.com/r/netsec/comments/1eqh66/0day\_windows\_kernel\_epa…](http://www.reddit.com/r/netsec/comments/1eqh66/0day%5Fwindows%5Fkernel%5Fepathobj%5Fvulnerability/) - [20130603 Re: exploitation ideas under memory pressure](http://archives.neohapsis.com/archives/fulldisclosure/2013-06/0006.html) (archives.neohapsis.com) mailing-list - [TA13-190A](http://www.us-cert.gov/ncas/alerts/TA13-190A) (us-cert.gov) third-party-advisory - [MS13-053](https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-053) (docs.microsoft.com) vendor-advisory - [twitter.com/taviso/statuses/335557286657400832](http://twitter.com/taviso/statuses/335557286657400832) ## Timeline 1. ID reserved May 24, 2013 2. Record published May 24, 2013 3. Added to CISA KEV Mar 28, 2022 4. Record last updated Oct 22, 2025 ## Look up another CVE ## About CubePath CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection. [Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection) Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:29 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)