CVE & CISA-KEV Catalog

CVE-2026-1773

HIGH
7.5
CVSS v3
NVD

Description

IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame. Product is only affected if IEC 60870-5-104 bi-directional functionality is configured. Enabling secure communication following IEC 62351-3 does not remediate the vulnerability but mitigates the risk of exploitation.

CWE-184

How to fix

Remediation Available
rtu520 firmwareNVD
Affected:>= 13.7.1, < 13.7.8Fixed in:13.7.8CVE-2026-1773derived from NVD
rtu530 firmwareNVD
Affected:>= 13.7.1, < 13.7.8Fixed in:13.7.8CVE-2026-1773derived from NVD
rtu540 firmwareNVD
Affected:>= 13.7.1, < 13.7.8Fixed in:13.7.8CVE-2026-1773derived from NVD
rtu560 firmwareNVD
Affected:>= 13.7.1, < 13.7.8Fixed in:13.7.8CVE-2026-1773derived from NVD

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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 ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

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

Exploit Intelligence

0.41%probability of exploitation in 30 days
34thpercentile

Low risk: more likely to be exploited than 34% of all known CVEs.

References

Related Vulnerabilities

Other CWE-184 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-5217Critical9.8100%KEV-
CVE-2022-43396High8.855%-Fix
CVE-2017-7525Critical9.838%-Fix
CVE-2024-5178Medium4.934%--
CVE-2018-7489Critical9.820%-Fix
CVE-2018-6383High8.813%--

Common questions

How do I fix CVE-2026-1773?

Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-1773 being actively exploited?

Not that we know of. CVE-2026-1773 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.41% is the estimated probability that it will be exploited in the next 30 days. That is higher than 34% of all scored CVEs.

How severe is CVE-2026-1773?

CVE-2026-1773 has a CVSS v3 base score of 7.5, rated high. 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-2026-1773 affect?

Published advisories record a fix for rtu520 firmware (NVD), rtu530 firmware (NVD), rtu540 firmware (NVD), rtu560 firmware (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 2026-05-26.