Is CVE-2018-20250 (WinRAR Absolute Path Traversal) being exploited in the wild?

Yes. CISA added CVE-2018-20250 to its Known Exploited Vulnerabilities catalogue on 15 February 2022, which it does only when there is reliable evidence of active exploitation. CISA lists it as known to be used in ransomware campaigns. WinRAR Absolute Path Traversal vulnerability leads to Remote Code Execution Any organisation running the affected product should treat remediation as urgent.

What “exploited in the wild” means for this CVE

For a CVE like this, “exploited in the wild” means there is credible evidence that attackers are actively using it, not just that a proof of concept exists. In practice, the most useful signal is whether the vulnerability has reached CISA’s KEV catalogue, because that catalogue is curated for known active exploitation and drives urgent remediation priorities.

The immediate question is not only whether the flaw is real, but whether it is still reachable in your environment. For archive utilities and similar desktop software, exposure can persist on workstations, jump hosts, and file-processing systems long after teams believe the product is “just installed for occasional use.”

When a vulnerability is already in KEV, the operational assumption should shift from routine patch planning to active exposure management. The right reading is: if the product remains installed, the attack surface remains meaningful until the affected code path is removed, patched, or otherwise neutralised.

How to confirm whether you are exposed

Start by identifying every host where the product is installed, including unmanaged endpoints, temporary admin systems, and VDI images. That inventory matters more than a single endpoint check, because exploited desktop software is often missed outside traditional server patching workflows.

Then determine whether any workflows ever open untrusted archives from email, web downloads, shared drives, or support tickets. The risk is highest where archive handling is part of a routine business process, because exploitation usually depends on a user or service processing attacker-controlled content.

Use the vendor advisory and the CISA Known Exploited Vulnerabilities Catalog to verify the current remediation status and any product-specific instructions. For the record itself, the CVE Program is the canonical reference for the vulnerability identifier, while NIST National Vulnerability Database is the place to check the published metadata tied to the record.

What to do if patching is delayed

If immediate remediation is not possible, reduce exposure by removing the vulnerable software from systems that do not truly need it, and by restricting where untrusted archives can be opened. That is especially important for endpoints with elevated rights, because archive-handling flaws become much more consequential when the user context is privileged.

Compensating controls should focus on reducing the chance that malicious content reaches the vulnerable parser, and on limiting what happens if it does. File-control, application allowlisting, download restrictions, and endpoint monitoring are all more defensible than hoping users will avoid suspicious archives on their own.

If the system has already processed potentially malicious archives, treat the issue as a compromise check, not just a patching task. Archive traversal flaws can be used as an initial execution path, so the question becomes whether anything else was dropped, launched, or persisted after the archive was opened.

Risk and Threat Considerations

This kind of vulnerability is attractive because it can convert a simple file-open action into code execution. Once exploitation is possible from archive handling, the attacker no longer needs a separate exploit chain to reach the local system context.

Failure mechanism: An archive is crafted so that extracted paths escape the intended destination and overwrite or place files in a sensitive location, allowing malicious code to be executed when the archive is processed.

Impact: The result can be remote code execution on the endpoint, followed by payload staging, credential theft, persistence, and, in enterprise environments, broader compromise of adjacent systems or data.

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 and risk surface, while CIS Controls v8, NIST SP 800-53 Rev 5 and OWASP ASVS set the governance and control requirements practitioners need to meet.

Framework	Control / Reference	Relevance
CIS Controls v8	CIS-7 — Continuous Vulnerability Management	KEV-listed exploitation requires fast asset discovery and remediation prioritisation.
Recommendation — Prioritise and remediate exposed systems using continuous vulnerability management.
NIST SP 800-53 Rev 5	SI-2 — Flaw Remediation	The issue is an actively exploited software flaw that must be corrected or mitigated quickly.
	RA-5 — Vulnerability Monitoring and Scanning	Confirm exposure by identifying installations and tracking vulnerable instances.
Recommendation — Patch or mitigate the flaw promptly and verify remediation across affected systems. Scan for installed instances and monitor vulnerable assets until exposure is eliminated.
OWASP ASVS	V15 — Secure Coding and Architecture	Path traversal leading to code execution reflects a core application security flaw pattern.
Recommendation — Review file-handling paths and path normalisation logic to prevent traversal abuse.
MITRE ATT&CK	T1203 — Exploitation for Client Execution	The flaw can execute code when a user or process opens crafted content.
Recommendation — Map archive-opening execution paths to client-execution detections and hunt for suspicious child processes.

Practitioner Guidance

What to prioritise: Treat KEV-listed desktop and endpoint software as urgent exposure items, even when they are not internet-facing. A file-processing vulnerability that is already being exploited deserves faster action than a generic medium-severity patch queue item.

What to verify: Confirm whether any endpoints still run the product, whether archives are opened from untrusted sources, and whether your EDR or logging stack can show archive-triggered process creation, unusual child processes, or post-exploitation tooling.

Decision rule: If the vulnerable product is present on a system that processes external content, prioritise removal or remediation before assuming that user awareness or email filtering will be enough.

Practitioner takeaway: With actively exploited archive flaws, the real decision is not whether the CVE matters, but whether your asset inventory and response process are fast enough to contain it before a user or service opens the wrong file.