CVE-2018-8836 — Wago 750 Series PLCs with firmware version 10 and prior include a remote attack

Wago 750 Series PLCs with firmware version 10 and prior include a remote attack may take advantage of an improper implementation of the 3 way handshake during a TCP connection affecting the communications with commission and service tools. Specially crafted packets may also be se

01What is this vulnerability?

Wago 750 Series PLCs with firmware version 10 and prior include a remote attack may take advantage of an improper implementation of the 3 way handshake during a TCP connection affecting the communications with commission and service tools. Specially crafted packets may also be sent to Port 2455/TCP/IP, used in Codesys management software, which may result in a denial-of-service condition of…

02Affected products

Vendor	Product	Versions
WAGO	WAGO 750 Series	750-880 firmware version 10 and prior, 750-881 firmware version 10 and prior, 750-852 firmware version 10 and prior, 750-882 firmware version 10 and prior, 750-885 firmware version 10 and prior, 750-831 firmware version 10 and prior, 750-889 firmware version 10 and prior, 750-829 firmware version 10 and prior

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-04-03T13:00:00.000Z
• Last modified: 2024-09-17T04:13:48.585Z

09References

• www.securityfocus.com — http://www.securityfocus.com/bid/103726
• ics-cert.us-cert.gov — https://ics-cert.us-cert.gov/advisories/ICSA-18-088-01
• www.wago.com — https://www.wago.com/medias/Vulnerability-in-the-WAGO-Ethernet-TCP-IP-driver.pdf…