CVE-2018-13383

A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to p…

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CVSS 4.3 (MEDIUM) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

7.8/10

General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?

Recorded exploitation baseline: +7.00
Technical severity: CVSS 4.3: +0.64
Fresh EPSS: 32.47%: +0.16

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

Sources: 4 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

BleepingComputer

Press · 11 Jan 2022, 08:00 · CISA alerts federal agencies of ancient bugs still being exploited - BleepingComputer

BleepingComputer

Press · 07 Feb 2021, 08:00 · Fortinet fixes critical vulnerabilities in SSL VPN and web firewall - BleepingComputer

TechTarget

Press · 08 Oct 2019, 07:00 · NSA warns VPN vulnerabilities exploited by nation-state hackers - TechTarget

National Cyber Security Centre

Press · 02 Oct 2019, 07:00 · Vulnerabilities exploited in VPN products used worldwide - National Cyber Security Centre

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 7.8 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

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 4.3; EPSS 32.5%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network access, low 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 13:57:56.535692+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

Published

29 May 2019, 17:20

First press mention

02 Oct 2019, 07:00

Added to the CISA KEV catalog

10 Jan 2022, 00:00

Latest press mention

11 Jan 2022, 08:00

Score calculated

05 Nov 2026, 13:57