CVE-2023-27997

criticalpriority · act · 90OT risk · criticalKEV · exploitedEU KEV · CNWEPSS 0.857 · 100 %ileexploit · PoCDEEURUUS

grimoire priorityP0 · Act now

Exploitable?

Yes · in the wild

CISA KEV · 12 exploits · PoC

Likely / severe?

85.7% (100th) EPSS

CVSS 9.8 · critical

Is it mine?

77 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

added 2023-06-13remediate by 2023-07-04

required action Apply updates per vendor instructions.

EU KEVflagged by CNWreported 2025-01-23patched 2023-06-09ransomware

Heap-based buffer overflow vulnerability may allow remote attackers to execute arbitrary code or commands

EPSS · scored 2026-10-26

Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedRUGGEDCOM APE1808siemens_psirt
Update Fortigate NGFW to V7.4.7. Contact customer support to receive patch and update information
FixedRUGGEDCOM APE1808cisa_csaf_ot
Update Fortigate NGFW to V7.4.7. Contact customer support to receive patch and update information
MitigationRUGGEDCOM APE1808siemens_psirt
Refer to Fortinet Blog for mitigation measures https://www.fortinet.com/blog/psirt-blogs/analysis-of-threat-actor-activity
MitigationRUGGEDCOM APE1808cisa_csaf_ot
Refer to Fortinet Blog for mitigation measures https://www.fortinet.com/blog/psirt-blogs/analysis-of-threat-actor-activity

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.2criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:X/RC:Rsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@fortinet.comexploitability 3.9 · impact 5.9

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Siemens ProductCERT DE

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: active · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-122USCWE-122USCWE-122USCWE-122US

ATT&CK techniques

ATT&CK techniques this enables or maps to.

exploits (12)

Public proof-of-concept and weaponised exploit code.

BishopFox/CVE-2023-27997-checkSafely detect whether a FortiGate SSL VPN instance is vulnerable to CVE-2023-27997 based on response timingPoC · poc_in_github
Cyb3rEnthusiast/CVE-2023-27997How to get access via CVE-2022-27997PoC · poc_in_github
TechinsightsPro/ShodanFortiOSSearch vulnerable FortiOS devices via Shodan (CVE-2023-27997)PoC · poc_in_github
Vampsecure-Labs/vamp-forticheckVampSecure Labs: FortiOS CVE scanner (CVE-2018-13379, CVE-2022-40684, CVE-2023-27997, CVE-2024-21762)PoC · poc_in_github
abraxas/Fortigate-SSL-VPN-Exploit-KitThe FortiGate SSL-VPN pot of gold. CVE-2024-21762 and CVE-2023-27997. 79 working exploit clients. 53 hardware SKUs. 55 FortiOS builds. PoC · poc_in_github
delsploit/CVE-2023-27997delsploit/CVE-2023-27997PoC · poc_in_github

affected products (77)

Products and version ranges known to be affected.

RUGGEDCOM APE1808all versionscisa_csaf_otUS
Siemens RUGGEDCOM APE1808≤ vers:all/*cisa_csaf_otUS
Fortinet FortiOS≤ 6.4.0 ≤6.4.12enisa_euvdEU
Fortinet FortiOS≤ 6.2.0 ≤6.2.13enisa_euvdEU
Fortinet FortiOS≤ 7.2.0 ≤7.2.4enisa_euvdEU
Fortinet FortiOS≤ 6.0.0 ≤6.0.16enisa_euvdEU
Fortinet FortiOS≤ 7.0.0 ≤7.0.11enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.4.2enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.0.10enisa_euvdEU
Fortinet FortiOS-6K7K≤ 7.0.10enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.4.8enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.0.12 ≤6.0.16enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.4.12enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.2.4enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.2.9 ≤6.2.13enisa_euvdEU
Fortinet FortiOS-6K7K≤ 7.0.5enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.2.6 ≤6.2.7enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.4.10enisa_euvdEU
Fortinet FortiOS-6K7K≤ 6.4.6enisa_euvdEU
Fortinet FortiProxy≤ 7.0.0 ≤7.0.9enisa_euvdEU

showing 20 of 77

advisories (3)

Vendor and ecosystem advisories describing this.

SSA-770770SSA-770770: Multiple Vulnerabilities in Fortigate NGFW Before V7.4.7 on RUGGEDCOM APE1808 Devices2025-02-11csaf · siemens_psirtDE
Fortinet has published information on vulnerabilities in FortiOS. This advisory lists the related Siemens Industrial products. Siemens has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.
WID-SEC-W-2023-1411Fortinet FortiOS und FortiProxy: Schwachstelle ermöglicht CodeausführungDeutsch2023-06-11csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Fortinet FortiOS und FortiProxy ausnutzen, um beliebigen Programmcode auszuführen.
ICSA-25-044-06Siemens RUGGEDCOM APE18082025-02-11icsa · cisa_csaf_otUS
Fortinet has published information on vulnerabilities in FortiOS. This advisory lists the related Siemens Industrial products. Siemens has released a new version for RUGGEDCOM APE1808 and recommends to update to the latest version.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot siemens_psirt cert_bund NVD CVE.org MITRE

published 2023-06-13modified 2026-07-31

related (16,044)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-86950US	—OT critical	26.2% (98th)	KEV	2026-09-28
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.7.1 and iPadOS 26.7.1, macOS Sequoia 15.8.1, macOS Tahoe 26.7.1. Processing…
CVE-2026-87491US	—OT critical	3.51% (89th)	KEV	2026-09-09
Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security…
CVE-2026-53362US	—OT critical	0.71% (53rd)	KEV	2026-07-04
In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branc…
CVE-2026-53266US	—OT critical	0.93% (61st)	KEV	2026-06-25
In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source addre…
CVE-2026-11645US	—OT critical	2.44% (84th)	KEV	2026-06-09
Out of bounds read and write in V8 in Google Chrome prior to 149.0.7827.103 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium…

+16039 more

references (6)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan