Moxa switches vulnerable to TLS DoS flaw
An old TLS client-initiated renegotiation DoS vulnerability affects several Moxa industrial switch product lines with fixes available.
Sourcecert.ssi.gouv.fr — open the original
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- Applies to
- The 1 CVE named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- No exploitation in the wild and no public exploit is recorded for the CVEs named.
The French cybersecurity agency ANSSI issued an advisory covering multiple Moxa industrial networking products, including EDS-510A, ICS-G7826A, and several SDS-3000/G3000 series switches. The vulnerability, tracked as CVE-2011-1473, relates to TLS client-initiated renegotiation and can be exploited remotely to cause a denial-of-service condition on affected devices.
This is a long-known TLS protocol weakness (originally disclosed in 2011) that Moxa has now addressed in updated firmware versions for its industrial switch product lines, as detailed in Moxa security bulletin mpsa-262810 published August 19, 2026. Organizations using these Moxa devices in operational technology or industrial control environments should apply the vendor-supplied patches to remediate the risk. No evidence of active exploitation is noted in the advisory.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1055
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