CVE-2026-18717

highpriority · track · 0EPSS 0.003 · 20 %ileUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.27% (20th) EPSS
CVSS 7.4 · high
Is it mine?
2 products
Check your exposure
Who says so?
1 sources
cisa_csaf_ot

EPSS · scored 2026-10-27

ASE2000 2.35 through 2.37 is vulnerable to an improper certificate validation vulnerability, which may allow an attacker to impersonate the trusted peer, complete the TLS handshake, and read or modify protected communications.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • FixedASE2000cisa_csaf_ot

    Avoid using IEC 60870-5-104 over TLS across untrusted or shared networks; place ASE2000 hosts on an isolated, segmented network reachable only by intended peers.

  • MitigationASE2000cisa_csaf_ot

    ASE/Kalkitech provides an upgraded version 2.38 that fixes both vulnerabilities and customers are advised to upgrade to version 2.38. In version 2.38 the bundled log4net library is upgraded to version 3.3.1.0, and the IEC 60870-5-104 TLS client certificate validation logic is corrected to ensure proper validation of certificate error conditions.

02

cvss

Technical severity, 0–10. One row per scoring source.

9.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.9–9.1

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · CISA US
v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nsecondary · ics-cert@hq.dhs.gov USexploitability 2.2 · impact 5.2
v4.09.1criticalCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · ics-cert@hq.dhs.gov US
v4.06.9mediumCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-295USCWE-295US
05

affected products (2)

Products and version ranges known to be affected.

06

advisories (1)

Vendor and ecosystem advisories describing this.

  • ICSA-26-239-04Applied Systems Engineering ASE2000 V2 Communications Test Set2026-08-27icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could allow an attacker to read or write arbitrary local files, cause the application to issue outbound network requests, or intercept the connection to impersonate the trusted peer, complete the TLS handshake, and read or modify the protected communications.

07

sources

Which sources assert this record, and when.

cisa_csaf_otNVDCVE.orgMITRE
published 2026-08-28modified 2026-08-31
08

references (3) nvd

External citations — patches, advisories, analysis.

scry

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