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Vulnerability record · CVE-2017-6168 · published 17 November 2017

CVE-2017-6168: F5 big-ip ltm observable discrepancy vulnerability

F5 · Big Ip Ltm

On BIG-IP versions 11.6.0-11.6.2 (fixed in 11.6.2 HF1), 12.0.0-12.1.2 HF1 (fixed in 12.1.2 HF2), or 13.0.0-13.0.0 HF2 (fixed in 13.0.0 HF3) a virtual server configured with a Client SSL profile may be vulnerable to an Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) against RSA, which when exploited, may result in plaintext recovery of encrypted messages and/or a Man-in-the-middle (MiTM) attack, despite the attacker not having gained access to the server's private key itself, aka a ROBOT attack.

7.4 CVSS 3.0 High EPSS 20% · top 2.7% CWE-203 · Observable discrepancy
7.4CVSS 3.0 base score, v2 4.3
20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
10References
17 Jun 2026Last modified by NVD

Description

On BIG-IP versions 11.6.0-11.6.2 (fixed in 11.6.2 HF1), 12.0.0-12.1.2 HF1 (fixed in 12.1.2 HF2), or 13.0.0-13.0.0 HF2 (fixed in 13.0.0 HF3) a virtual server configured with a Client SSL profile may be vulnerable to an Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) against RSA, which when exploited, may result in plaintext recovery of encrypted messages and/or a Man-in-the-middle (MiTM) attack, despite the attacker not having gained access to the server's private key itself, aka a ROBOT attack.

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

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/101901 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039839 Third Party AdvisoryVDB Entry
https://robotattack.org/ Technical DescriptionThird Party Advisory
https://support.f5.com/csp/article/K21905460 Issue TrackingMitigationVendor Advisory
https://www.kb.cert.org/vuls/id/144389 Third Party AdvisoryUS Government Resource
http://www.securityfocus.com/bid/101901 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039839 Third Party AdvisoryVDB Entry
https://robotattack.org/ Technical DescriptionThird Party Advisory
https://support.f5.com/csp/article/K21905460 Issue TrackingMitigationVendor Advisory
https://www.kb.cert.org/vuls/id/144389 Third Party AdvisoryUS Government Resource

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2017-6168), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.