PT-2021-3822 · 3S Smart Software Solutions · Codesys Gateway V3

Denis Goryushev · Published 2021-08-04 · Updated 2021-08-11 · CVE-2021-36764

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions CODESYS Gateway V3 versions prior to 3.5.17.10

Description The issue is related to a NULL Pointer Dereference in the affected CODESYS products. Crafted communication requests may cause a Null pointer dereference, resulting in a denial-of-service condition. An attacker, acting remotely, can exploit this issue by sending a specially crafted TCP packet.

Recommendations For CODESYS Gateway V3 versions prior to 3.5.17.10, update to version 3.5.17.10 or later to resolve the issue. As a temporary workaround, consider restricting access to the affected CODESYS products to minimize the risk of exploitation.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2021-04150

CVE-2021-36764

Affected Products

Codesys Gateway V3

References · 9

• https://bdu.fstec.ru/vul/2021-04150 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-36764 · Security Note
• https://osv.dev/vulnerability/CVE-2021-36764 · Vendor Advisory
• https://safe.cnews.ru/news/line/2021-08-19_positive_technologies_pomogla_ispravit · Note
• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16804&token=d8c89c887979b22fdfc9fd5c3aa3804bbb1ddbff&download= · Note
• https://t.me/cibsecurity/26813 · Telegram Post
• https://vuldb.com/?id.180135 · Note
• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16804&token=d8c89c887979b22fdfc9fd5c3aa3804bbb1ddbff&download= · Note
• https://t.me/cvenotify/18627 · Telegram Post