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CVE-2023-27997UnknownPublished

tlp clear · KRVTZ-NET IDS alerts for 2026-05-18

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 29 Oct 2026, 19:04 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 29 Oct 2026.

What to do

Description

The KRVTZ-NET IDS alerts for 2026-05-18 report network reconnaissance and scanning activities targeting various systems, including attempts against Fortigate VPN (CVE-2023-27997). The alerts include probes for hidden files, user-agent tests, webcrawler scans, SQL injection time delay probes, and Laravel debug mode scans. These are informational observations without confirmed active exploitation or successful attacks. The overall severity is low due to the lack of confirmed exploitation.

Indicators of compromise

IP addresses 18

  • 194.62.107.162ET INFO Request to Hidden Environment File - Inbound
  • 194.62.107.225ET INFO Request to Hidden Environment File - Inbound
  • 2602:fb54:1a00::cbET INFO Request to Hidden Environment File - Inbound
  • 43.165.167.69ET USER_AGENTS User-Agent (_TEST_)
  • 43.164.131.148ET USER_AGENTS User-Agent (_TEST_)
  • 43.162.109.249ET USER_AGENTS User-Agent (_TEST_)
  • 125.209.235.186ET SCAN Naver Webcrawler User-Agent (Naver.me)
  • 110.93.150.100ET SCAN Naver Webcrawler User-Agent (Naver.me)
  • 211.249.46.42ET SCAN Naver Webcrawler User-Agent (Naver.me)
  • 110.93.150.74ET SCAN Naver Webcrawler User-Agent (Naver.me)

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