CVE-2015-0313 is an use-after-free vulnerability in Adobe Flash Player. CISA added it to the Known Exploited Vulnerabilities catalogue on 13 April 2022, which means attackers have used it in real attacks. Use-after-free vulnerability in Adobe Flash Player allows remote attackers to execute code.
What a use-after-free vulnerability means in Flash Player
A use-after-free is a memory-safety flaw where software continues to use an object after it has already been released. In a browser plugin like Adobe Flash Player, that can turn ordinary content handling into a memory corruption primitive that attackers can shape into code execution.
Flash content is especially sensitive to this class of bug because it processes complex, attacker-influenced input at runtime. When object lifetime and pointer validity are mishandled, the resulting corruption can affect control flow, heap state, or adjacent objects in ways that are difficult to predict and highly exploitable.
Why this vulnerability class is dangerous
Use-after-free bugs are dangerous because they often provide a path from malformed content to arbitrary code execution without requiring the user to install anything else. For an internet-facing runtime component, that means a malicious page, ad, or embedded object can potentially trigger the flaw during normal browsing.
The practical concern is not just crash risk. In exploitable memory corruption, the attacker may be able to influence what data is written or referenced after the free, which is why these issues are frequently treated as high-severity remote code execution candidates. For broader weakness context, see NHIMG’s CWE Top 25 Guide for how use-after-free fits into memory safety failures.
How organisations assess exposure and prioritise response
Exposure review starts with asset inventory: where Flash Player is installed, which browsers or endpoints still load it, and whether those systems can reach untrusted web content. If the software is present on endpoints that users browse with, the practical risk is materially higher than on isolated or tightly controlled systems.
For a CVE like this, authoritative version and exploitation detail should come from the official CVE record and the CISA KEV catalogue. Use the CVE Program to confirm the identifier and NIST National Vulnerability Database to review the record, while checking whether vendors have published any product-specific advisories or mitigations.
Remediation, detection, and post-exploitation review
The right response is to remove or update the vulnerable component as soon as the vendor and exposure conditions allow. Where immediate patching is not possible, reduce attack surface by disabling the plugin, restricting browser use, isolating affected systems, and limiting access to untrusted content.
Detection should focus on exploit delivery and aftermath: unusual browser crashes, suspicious child processes, injected code, or signs that the endpoint executed content from a hostile page. After patching, assume the system may already have been targeted and review for secondary payloads, persistence mechanisms, and any credential or session exposure that could have occurred after code execution.
Risk and Threat Considerations
Because CISA added this CVE to the KEV catalogue, organisations should treat it as a real-world exploited weakness rather than a theoretical bug. The main risk is that a successful exploit can give a remote attacker code execution on a user endpoint, which may be enough to establish a foothold, deliver additional malware, or pivot deeper into the environment.
Failure mechanism: A crafted Flash payload triggers the use-after-free, corrupts memory, and steers execution into attacker-controlled code or a useful crash-to-exploit sequence.
Impact: A compromised endpoint can lead to malware installation, data access, browser-session theft, and lateral movement if the affected system has broader network or identity access.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack surface, NIST SP 800-53 Rev 5, CIS Controls v8 and NIST CSF 2.0 set the technical controls, and ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| MITRE ATT&CK | T1203 — Exploitation for Client Execution | Use-after-free exploitation is a client-side path to code execution. |
| Recommendation — Hunt for exploit delivery and client execution indicators in browser telemetry. | ||
| NIST SP 800-53 Rev 5 | SI-16 — Memory Protection | Memory-safety failures like use-after-free directly relate to protecting runtime memory integrity. |
| Recommendation — Apply SI-16 controls to reduce memory-corruption impact in exposed client software. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | KEV-listed CVEs require prioritised discovery, validation, and remediation across assets. |
| Recommendation — Prioritise and remediate KEV-listed exposures across all affected endpoints. | ||
| NIST CSF 2.0 | DE.CM-08 — Malicious Code Detected | Exploit attempts and payload delivery are monitored as malicious code activity. |
| Recommendation — Monitor endpoints for exploit payloads and suspicious post-exploitation behaviour. | ||
| ISO/IEC 27001:2022 | A.8.8 — Management of technical vulnerabilities | CVE exposure and remediation fall under technical vulnerability management. |
| Recommendation — Track, assess, and remediate the vulnerable software as part of vulnerability management. | ||
Practitioner Guidance
Why practitioners should care: Treat browser-plugin memory-safety issues as endpoint compromise risks, not just application defects. A CVE in a widely deployed runtime can become an entry point for phishing, drive-by exploitation, or post-compromise staging.
What to watch for: Focus on whether the vulnerable software is still installed, whether users can reach untrusted content, and whether crash telemetry or EDR alerts suggest attempted exploitation. If the plugin cannot be removed immediately, containment matters as much as patch timing.
Practitioner takeaway: For KEV-listed client-side RCE flaws, the safest assumption is that exposure exists somewhere until inventories, browser controls, and patch state prove otherwise.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org