CVE-2017-6297

The L2TP Client in MikroTik RouterOS versions 6.83.3 and 6.37.4 does not enable IPsec encryption after a reboot, which allows man-in-the-middle attackers to view transmitted data unencrypted and gain access to networks on the L2TP server by monitoring the packets for the transmitted data and obtaining the L2TP secret.

CVSS v3.0 NVD

5.9 MEDIUMCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 NVD

4.3 MEDIUMAV:N/AC:M/Au:N/C:P/I:N/A:N

EPSS

0.74% chance of exploitation in the next 30 days, 54th percentile

Published

2017-02-27

Updated

2026-09-16

Proof-of-concept exploits (1)

• https://blog.milne.it/2017/02/24/mikrotik-routeros-security-vulnerability-l2tp-tunnel-une…

Security advisories

• http://www.securityfocus.com/bid/96447
• https://blog.milne.it/2017/02/24/mikrotik-routeros-security-vulnerability-l2tp-tunnel-une…

References

• CVE Record
• NVD entry