The "PCB Mobile" by Phelps County Bank app 3.0.2 -- aka pcb-mobile/id436891295 for iOS does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
CVE-2017-9591
MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence
Score 5.9 from GitHub Security Advisory published 2022-05-13. NVD baseline CVSS 5.9; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.9Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.9
- EG Score
- 5.9(medium)
- EPSS
- 37.8%
- KEV
- Not listed
Published
June 16, 2017
Last Modified
May 13, 2026
References (2)
Frequently asked(5)
What is CVE-2017-9591?
CVE-2017-9591 is a medium vulnerability published on June 16, 2017. The "PCB Mobile" by Phelps County Bank app 3.0.2 -- aka pcb-mobile/id436891295 for iOS does not verify X.509 certificates from SSL servers, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.
When was CVE-2017-9591 disclosed?
CVE-2017-9591 was first published in the National Vulnerability Database on June 16, 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-2017-9591 actively exploited?
CVE-2017-9591 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-9591?
CVE-2017-9591 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2017-9591?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-9591, 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.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2017-9591
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