What is CVE-2018-5258?

CVE-2018-5258 is a medium-severity vulnerability in Banconeon Neon, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2018-01-17.

How severe is CVE-2018-5258?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Banconeon Neon

CVE-2018-5258

The Neon app 1.6.14 iOS does not verify X.509 certificates from SSL servers, which allows remote attackers to spoof servers and obtain sensitive information via a crafted certificate.

Vulnerability class: Improper Certificate Validation

Published 2018-01-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (56.6th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Banconeon Neon — versions 1.6.14

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

gist.github.com/rlaneth/d2203c206d5d5acbdaf6069e78b1d07f (Third Party Advisory, Issue Tracking)
www.tecmundo.com.br/seguranca/126192-banco-neon-falha-permite-hacker-acesse-con… (Third Party Advisory)
radialle.com/cve-2018-5258-writeup-aplicativo-do-banco-neon-para-ios-não-valida… (Third Party Advisory)

Frequently asked questions

What is CVE-2018-5258?: CVE-2018-5258 is a medium-severity vulnerability in Banconeon Neon, classified under Improper Certificate Validation. CVSS score: 5.9/10. Published 2018-01-17.
How severe is CVE-2018-5258?: Medium severity. CVSS v3 base score is 5.9 out of 10.