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CVE-2019-5591

A Default Configuration vulnerability in FortiOS may allow an unauthenticated attacker on the same subnet to intercept sensitive information by impersonating the LDAP server.

CVSS 6.5 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.1/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 6.5: +0.97
  • Fresh EPSS: 18.57%: +0.09

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 11 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Security Affairs
Press · 25 Dec 2025, 08:00 · Five-year-old Fortinet FortiOS SSL VPN vulnerability actively exploited - Security Affairs
The Hacker News
Press · 15 Sep 2022, 07:00 · U.S. Charges 3 Iranian Hackers and Sanctions Several Others Over Ransomware Attacks - The Hacker News
Sophos
Press · 12 May 2022, 07:00 · COBALT MIRAGE Conducts Ransomware Operations in U.S. - Sophos
CPO Magazine
Press · 25 Nov 2021, 08:00 · US, UK, and Australian Agencies Issue Joint Cybersecurity Advisory on Iranian APT Groups Targeting Critical Infrastructure - CPO Magazine
The Hacker News
Press · 18 Aug 2021, 07:00 · Unpatched Remote Hacking Flaw Disclosed in Fortinet's FortiWeb WAF - The Hacker News
See all 11 source documents
The Hacker News
Press · 29 Jul 2021, 07:00 · Top 30 Critical Security Vulnerabilities Most Exploited by Hackers - The Hacker News
Qualys
Press · 28 Jul 2021, 07:00 · CISA Alert: Top Routinely Exploited Vulnerabilities - Qualys
TechTarget
Press · 05 Apr 2021, 07:00 · CISA: APTs exploiting Fortinet FortiOS vulnerabilities - TechTarget
BankInfoSecurity
Press · 03 Apr 2021, 07:00 · FBI and CISA: APT Groups Targeting Government Agencies - BankInfoSecurity
BleepingComputer
Press · 02 Apr 2021, 07:00 · FBI and CISA warn of state hackers attacking Fortinet FortiOS servers - BleepingComputer
The Record from Recorded Future News
Press · 01 Apr 2021, 07:00 · US says APTs are using Fortinet bugs to gain initial access for future attacks - The Record from Recorded Future News

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.1 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

1

Public exploit entries / repo candidates

See 1 repos with metrics
RepositoryStarsForksLanguageUpdated
ayewo/fortios-ldap-mitm-poc-CVE-2019-559110Python17 Oct 2025, 22:33
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 6.5; EPSS 18.6%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
adjacent access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:09.064523+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
14 Aug 2020, 15:28
First press mention
01 Apr 2021, 07:00
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
25 Dec 2025, 08:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
1 repositories