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CVE-2023-27997UnknownPublished

tlp clear · KRVTZ-NET IDS alerts for 2026-02-09

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, 17:16 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. 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

The KRVTZ-NET IDS alerts from February 9, 2026, report reconnaissance and scanning activities targeting network infrastructure, especially Fortigate VPN devices and submission services. The activity includes brute force attempts from IP 152.32.151.39 and exploitation attempts of CVE-2023-27997 from IP 2001:470:1:332::148. Some attackers use Google Webcrawler user-agent spoofing to evade detection. No active exploitation or ransomware campaigns are currently reported, but these reconnaissance actions could lead to more serious attacks. European organizations using Fortigate VPNs are particularly at risk. The threat is assessed as low severity but could impact confidentiality and integrity if unmitigated. Recommended mitigations include proactive patching, enhanced monitoring, multi-factor authentication, and network segmentation.

Indicators of compromise

IP addresses 5

  • 152.32.151.39haproxy: 152.32.151.39 connecting to (submission/TCP) 15x in hour, possible bruteforcing.
  • 2001:470:1:332::148ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)
  • 165.165.120.46ET SCAN Google Webcrawler User-Agent (Mediapartners-Google)
  • 14.176.76.54ET SCAN Google Webcrawler User-Agent (Mediapartners-Google)
  • 14.244.210.136ET SCAN Google Webcrawler User-Agent (Mediapartners-Google)

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