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CVE-2023-27997UnknownPublished

tlp clear · KRVTZ-NET IDS alerts for 2026-02-13

Affects tlp clearSource CIRCL OSINT Feed

0

TLP:CLEAR, disclosure is not limited

Authoritative record:CVE-2023-27997· Critical 9.2

Exploited in the wild · used in ransomware campaigns · KEV due 4 Jul 2023 · public exploit available · 85% EPSS : block it and hunt for it in your logs now.

Data as of 26 Oct 2026, 12:54 UTC

CVSS 3.1 base score
9.2Critical
How severe the flaw is on the 0–10 CVSS scale.
KEV deadline
 US federal agencies must patch by this date; a sensible deadline for everyone else.
Ransomware
Used in ransomware campaigns
EPSS
85.6% chance of exploitation in 30 days – higher than 99% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:X/RC:R

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 13 Jun 2023

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: evidence found.

    CVSS exploit maturity: proof of concept public

  4. Exploited in the wild: evidence found.

    Listed in CISA KEV the same day as disclosure

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by Fortinet, Inc.

    , 96 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. Added to CISA KEV (opens in a new tab)

    exploitation confirmed · ransomware use known

    , the same day as disclosure

  4. KEV remediation due

    US federal deadline

    , 21 days after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Description

KRVTZ-NET IDS alerts from February 13, 2026, report active reconnaissance targeting Fortigate VPN devices and web servers. The reconnaissance includes repeated GET requests to the /remote/logincheck endpoint attempting to exploit CVE-2023-27997, a critical unauthenticated remote code execution vulnerability. Additional scanning involves suspicious user-agent strings and probes for sensitive files. No confirmed exploitation is reported, and the activity is rated low severity due to its reconnaissance nature. Organizations using Fortigate VPNs, especially in Europe, should prioritize patching and monitoring to prevent escalation.

Indicators of compromise

IP addresses 7

  • 14.172.26.24ET SCAN Google Webcrawler User-Agent (Mediapartners-Google)
  • 2001:470:2cc:1::1ffET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
  • 216.26.242.194ET HUNTING Suspicious User-Agent Observed (Mozilla/5.0 (Windows NT XX.X Win64 x64) AppleWebKit/XXX.XX)
  • 104.207.32.90ET INFO Request to Hidden Environment File - Inbound
  • 66.132.153.117- i Censys - HTTP User-Agent Scanner
  • 20.250.11.129ET WEB_SERVER WEB-PHP phpinfo access
  • 162.142.125.202- i Censys - HTTP User-Agent Scanner

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