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Report · CIRCL OSINT FeedAbout CVE-2023-27997Published

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

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 · no patch yet : apply the vendor's fix or mitigations to tlp clear now.

Data as of 5 Nov 2026, 23:23 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.
Patch
Not yet available
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 5 Nov 2026.

What to do

Description

KRVTZ-NET IDS alerts from February 2, 2026, report reconnaissance and early exploitation attempts targeting Fortigate VPN devices via CVE-2023-27997. The activity includes repeated GET requests to the /remote/logincheck endpoint, inbound requests to hidden environment files, and HTTP User-Agent scanning from known scanners like Censys. No active exploits are confirmed in the wild and no patches are currently available. The threat mainly affects organizations using Fortigate VPN appliances, with European countries such as Germany, France, the UK, Netherlands, Italy, Spain, Belgium, and Sweden at elevated risk. The threat is assessed as high severity due to potential impact and ease of exploitation despite low immediate risk. Mitigation involves enhanced network monitoring, access restrictions, IDS/IPS deployment, and proactive vulnerability management.

Indicators of compromise

IP addresses 3

  • 115.68.102.23ET INFO Request to Hidden Environment File - Inbound
  • 2620:96:e000::12b- i Censys - HTTP User-Agent Scanner
  • 2001:470:1:c84::29ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)

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