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CVE-2023-27997UnknownPublished

tlp clear · KRVTZ-NET IDS alerts for 2026-05-08

Affects tlp clearSource CIRCL OSINT Feed

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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 30 Oct 2026, 11:52 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. Other KEV due dates
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. Weaponized: 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 30 Oct 2026.

What to do

Description

The KRVTZ-NET IDS alerts for May 8, 2026, report network reconnaissance and scanning activities, including exploit attempts targeting Fortigate VPN devices via repeated GET requests to the /remote/logincheck endpoint. These attempts are linked to CVE-2023-27997. The alert does not specify affected product versions or confirm successful exploitation. Known exploits in the wild exist, and the vulnerability is associated with CWE-122. Patch availability is not confirmed in this alert, and the severity is assessed as low.

Indicators of compromise

IP addresses 21

  • 4.227.176.58ET INFO Request to Hidden Environment File - Inbound
  • 89.249.195.18ET SCAN Exabot Webcrawler User Agent
  • 104.239.41.28ET SCAN Exabot Webcrawler User Agent
  • 92.113.119.138ET SCAN Exabot Webcrawler User Agent
  • 150.109.46.88ET USER_AGENTS User-Agent (_TEST_)
  • 2001:470:1:fb5::200ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
  • 43.157.175.122ET USER_AGENTS User-Agent (_TEST_)
  • 2001:470:1:332::37ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
  • 43.157.67.70ET USER_AGENTS User-Agent (_TEST_)
  • 119.28.89.249ET USER_AGENTS User-Agent (_TEST_)

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