CVE-2014-0497 is an integer underflow vulnerablity vulnerability in Adobe Flash Player. CISA added it to the Known Exploited Vulnerabilities catalogue on 17 September 2024, which means attackers have used it in real attacks. Adobe Flash Player contains an integer underflow vulnerability that allows a remote attacker to execute arbitrary code.
What an integer underflow vulnerability means in Flash Player
An integer underflow is a memory- or bounds-checking failure where a calculation drops below zero and wraps to an unexpected value. In a browser plugin such as Flash Player, that can turn a normal parsing step into unsafe memory access and a route to code execution.
The danger is not the arithmetic bug by itself, but what it enables when attacker-controlled content reaches the vulnerable code path. For legacy browser plugins, that often means a crafted media or document payload can move from a simple crash into arbitrary code execution inside the host process.
Why this CVE was dangerous in practice
This CVE was dangerous because it was already being used in real attacks, and CISA added it to the Known Exploited Vulnerabilities catalogue on 17 September 2024. That makes it a live exploitation issue, not just a theoretical weakness.
When a remotely reachable content parser has an integer underflow, the main practical concern is reliable exploitation at scale. Attackers can use malformatted input to trigger memory corruption, which can lead to process compromise, sandbox escape attempts, or follow-on payload delivery.
For context on exploited-vulnerability triage, NIST National Vulnerability Database is useful for record-level vulnerability data, while the CVE Program is the authoritative source for the identifier and record structure.
How organisations assess exposure to CVE-2014-0497
Exposure assessment starts with asset inventory: determine whether any systems still contain Adobe Flash Player, especially on unmanaged endpoints, legacy kiosks, archived virtual machines, or software bundles that were never fully removed.
Organisations should also check whether the vulnerable component is internet-facing or can be reached through user-driven content, embedded web applications, or internal portals that still render legacy Flash objects. Vendor advisories and the CISA KEV catalogue should be treated as the authoritative sources for version and remediation status, rather than reconstructing patch details from secondary reports.
For a broader response model for exploited flaws, NHIMG’s Zero-Day and Exploited Vulnerabilities Guide explains how to prioritise actively exploited issues, and NHIMG’s Vulnerability Management Guide covers asset scope, KEV prioritisation, exceptions, and verification.
Remediation, detection, and compromise review
The preferred remediation is to remove or disable Flash Player entirely, because unsupported browser plugins create avoidable attack surface. If immediate removal is not possible, organisations should reduce exposure by restricting execution paths, limiting user access to legacy content, and isolating systems that still depend on the plugin.
Detection should focus on abnormal browser or plugin behaviour, suspicious child processes, unexpected outbound connections, and memory-corruption crash patterns around content rendering. After patching or removal, review endpoints for signs that exploitation already occurred, because a vulnerability being fixed does not prove the environment was clean beforehand.
Where compromise is suspected, validate whether attacker activity led to browser process abuse, dropped payloads, or lateral movement from the affected workstation. If the vulnerable system handled any authenticated sessions or sensitive browser state, those sessions should be treated as potentially exposed.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-53 Rev 5, CIS Controls v8 and NIST CSF 2.0 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | Remediation of exploited software flaws is central to this CVE. |
| Recommendation — Prioritise removal or patching of the vulnerable Flash component under SI-2. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | This CVE requires inventory, prioritisation, and remediation of an actively exploited weakness. |
| CIS-10 — Malware Defenses | Exploitation can deliver malicious payloads and requires defensive monitoring. | |
| Recommendation — Track Flash exposure and remediate the vulnerable asset under CIS-7. Inspect endpoints for exploit-delivered payloads and suspicious activity under CIS-10. | ||
| NIST CSF 2.0 | PR.IP-12 — Vulnerability Management | Active exploitation makes vulnerability prioritisation and remediation materially relevant. |
| DE.CM-01 — Networks and devices are monitored to detect anomalies and events | Detection of exploit behaviour and post-compromise signs is a key response need. | |
| Recommendation — Prioritise this KEV-listed flaw for remediation under PR.IP-12. Monitor affected endpoints for exploit indicators under DE.CM-01. | ||
Practitioner Guidance
Why practitioners should care: Flash Player vulnerabilities are often legacy-risk issues, but exploited legacy software can still become the initial foothold for intrusion. Treat any remaining Flash dependency as a high-priority exposure, not a low-value nuisance.
What to watch for: Pay special attention to endpoints where Flash survived inside older applications, packaged runtimes, or remote access environments. Those are the places where an organisation is most likely to miss the exposure until an exploit lands.
Practitioner takeaway: For an actively exploited browser-plugin CVE, removal and exposure reduction matter as much as patching, because unsupported components often remain reachable long after formal deprecation.