CVE-2026-8673

Q: How do I fix CVE-2026-8673?

Upgrade avantra to 25.3.0 or later.

Q: Is CVE-2026-8673 being actively exploited?

Not that we know of. CVE-2026-8673 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.19% is the estimated probability that it will be exploited in the next 30 days. That is higher than 9% of all scored CVEs.

Q: How severe is CVE-2026-8673?

CVE-2026-8673 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2026-8673 affect?

Published advisories record a fix for avantra (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

5.9

CVSS v3

NVD

Description

Unprotected transport of credentials vulnerability in syslink software AG Avantra on Linux, Windows allows Sniffing Attacks. This issue affects Avantra: before 25.3.0.

CWE-523

How to fix

Remediation Available

avantraNVD

Affected:< 25.3.0Fixed in:25.3.0CVE-2026-8673derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

0.19%probability of exploitation in 30 days

9thpercentile

Low risk: more likely to be exploited than 9% of all known CVEs.

References

Vendor Advisory1

support.avantra.com

Related Vulnerabilities

Other CWE-523 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-28708	Medium	4.3	1.8%	-	Fix
CVE-2021-38460	High	7.5	1.8%	-	-
CVE-2020-25175	Critical	9.8	1.1%	-	-
CVE-2022-31805	High	7.5	1.0%	-	Fix
CVE-2024-1102	Medium	6.5	0.8%	-	Fix
CVE-2017-16731	High	8.8	0.7%	-	-

Common questions

How do I fix CVE-2026-8673?

Upgrade avantra to 25.3.0 or later.

Is CVE-2026-8673 being actively exploited?

Not that we know of. CVE-2026-8673 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.19% is the estimated probability that it will be exploited in the next 30 days. That is higher than 9% of all scored CVEs.

How severe is CVE-2026-8673?

CVE-2026-8673 has a CVSS v3 base score of 5.9, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-8673 affect?

Published advisories record a fix for avantra (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-23.