tlp clear · KRVTZ-NET IDS alerts for 2026-05-20
Affects tlp clearSource CIRCL OSINT Feed
TLP:CLEAR, disclosure is not limited
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
- 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:RExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 13 Jun 2023
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: evidence found.
Listed in CISA KEV the same day as disclosure
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by Fortinet, Inc.
, 96 days before disclosure
CVE published
on cve.org
, t = 0
Added to CISA KEV (opens in a new tab)
exploitation confirmed · ransomware use known
, the same day as disclosure
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
Apply updates per vendor instructions.
Description
On 2026-05-20, IDS alerts detected network reconnaissance activity involving two IP addresses. One IP made inbound informational requests to a hidden environment file. Another IP repeatedly accessed the Fortigate VPN /remote/logincheck endpoint, linked to CVE-2023-27997, a heap-based buffer overflow vulnerability. No confirmed exploitation or compromise was observed. The activity is classified as reconnaissance with low severity. There are known exploits and ransomware campaigns associated with this vulnerability, but no direct exploitation was confirmed in these alerts.
Indicators of compromise
IP addresses 2
- 5.255.102.136ET INFO Request to Hidden Environment File - Inbound
- 2001:470:1:fb5::1a0ET EXPLOIT Fortigate VPN - Repeated GET Requests to /remote/logincheck (CVE-2023-27997)