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CVE-2023-27997

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all version…

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A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.
CVSS 9.2 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.8/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9.2: +1.38
  • Fresh EPSS: 85.69%: +0.43

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

Sources: 15 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

The Hacker News
Press · 11 Apr 2025, 07:00 · Fortinet Warns Attackers Retain FortiGate Access Post-Patching via SSL-VPN Symlink Exploit - The Hacker News
CyberSecurityNews
Press · 13 Nov 2024, 08:00 · CISA, NSA, & FBI Release List of 15 Most Exploited Vulnerabilities in 2023 - CyberSecurityNews
SecurityWeek
Press · 13 Nov 2024, 08:00 · Citrix, Cisco, Fortinet Zero-Days Among 2023’s Most Exploited Vulnerabilities - SecurityWeek
Arctic Wolf
Press · 08 Feb 2024, 08:00 · Recommendations for CVE-2024-21762 and CVE-2024-23113 - Arctic Wolf
The Record from Recorded Future News
Press · 06 Feb 2024, 08:00 · Dutch intelligence finds Chinese hackers spying on secret Defence Ministry network - The Record from Recorded Future News
See all 15 source documents
Cyfirma
Press · 12 Jul 2023, 07:00 · XORTIGATE Vulnerability : Unmasking Critical Threats in Fortinet's FortiOS and FortiProxy SSL-VPN (CVE-2023-27997) - Cyfirma
The Hacker News
Press · 27 Jun 2023, 07:00 · New Fortinet's FortiNAC Vulnerability Exposes Networks to Code Execution Attacks - The Hacker News
SecurityWeek
Press · 13 Jun 2023, 07:00 · Fortinet Warns Customers of Possible Zero-Day Exploited in Limited Attacks - SecurityWeek
watchTowr Labs
Press · 13 Jun 2023, 07:00 · Xortigate, or CVE-2023-27997 - The Rumoured RCE That Was - watchTowr Labs
SOCRadar
Press · 13 Jun 2023, 07:00 · Fortinet Rolls Out Patches for Critical RCE Vulnerability in SSL VPN Devices (CVE-2023-27997) - SOCRadar
Rapid7
Press · 12 Jun 2023, 07:00 · CVE-2023-27997: Critical Fortinet Fortigate RCE Vulnerability - Rapid7
Information Security Buzz
Press · 12 Jun 2023, 07:00 · Critical RCE Flaw Discovered In Fortinet's FortiGate SSL-VPN Vulnerability, Patches Released - Information Security Buzz
The Hacker News
Press · 12 Jun 2023, 07:00 · Critical RCE Flaw Discovered in Fortinet FortiGate Firewalls - Patch Now! - The Hacker News
BleepingComputer
Press · 11 Jun 2023, 07:00 · Fortinet fixes critical RCE flaw in Fortigate SSL-VPN devices, patch now - BleepingComputer
Help Net Security
Press · 11 Jun 2023, 07:00 · Fortinet patches pre-auth RCE, update your Fortigate firewalls ASAP! (CVE-2023-27997) - Help Net Security

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 8.8 (2026-11-02 15:13). The curve appears once the score changes.

Public exploit evidence

3

Public exploit entries / repo candidates

See 3 repos with metrics
RepositoryStarsForksLanguageUpdated
rio128128/CVE-2023-27997-POC2715Python16 Jun 2023, 03:28
node011/CVE-2023-27997-POC02Python14 Nov 2024, 15:08
onurkerembozkurt/fgt-cve-2023-27997-exploit01Python21 Jun 2025, 18:53
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 9.2; EPSS 85.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network 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 13:58:52.927189+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
11 Jun 2023, 07:00
Added to the CISA KEV catalog
13 Jun 2023, 00:00
Published
13 Jun 2023, 08:41
Latest press mention
11 Apr 2025, 07:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
3 repositories
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar