This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Foxit Reader 8.3.1.21155. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of the xTsiz member of SIZ markers. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated object. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of the current process. Was ZDI-CAN-5013.
CVE-2017-14821
MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence
Score 6.5 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EPSS
- 82.5%
- KEV
- Not listed
Published
December 20, 2017
Last Modified
May 13, 2026
References (4)
- zdi-disclosures@trendmicrohttps://www.foxitsoftware.com/support/security-bulletins.php
- zdi-disclosures@trendmicrohttps://zerodayinitiative.com/advisories/ZDI-17-865
- af854a3a-2127-422b-91ae-364da2661108https://www.foxitsoftware.com/support/security-bulletins.php
- af854a3a-2127-422b-91ae-364da2661108https://zerodayinitiative.com/advisories/ZDI-17-865
Frequently asked(5)
What is CVE-2017-14821?
CVE-2017-14821 is a medium vulnerability published on December 20, 2017. This vulnerability allows remote attackers to disclose sensitive information on vulnerable installations of Foxit Reader 8.3.1.21155. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within…
When was CVE-2017-14821 disclosed?
CVE-2017-14821 was first published in the National Vulnerability Database on December 20, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-14821 actively exploited?
CVE-2017-14821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 82.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-14821?
CVE-2017-14821 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2017-14821?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-14821, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
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