CVE-2019-7477 Weak cryptography in SonicOS

What is CVE-2019-7477?

CVE-2019-7477 is a high-severity vulnerability in Sonicwall Sonicos, published on 2 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in SonicWall SonicOS and SonicOSv TLS CBC Cipher allow remote attackers to obtain sensitive plaintext data when CBC cipher suites are enabled. This vulnerability affected SonicOS Gen 5 version 5.9.1.10 and earlier, Gen 6 version 6.2.7.3, 6.5.1.3, 6.5.2.2, 6.5.3.1, 6.2.7.8, 6.4.0.0, 6.5.1.8, 6.0.5.3-86o and SonicOSv 6.5.0.2-8v_RC363 (VMWARE), 6.5.0.2.8v_RC367 (AZURE), SonicOSv 6.5.0.2.8v_RC368 (AWS), SonicOSv 6.5.0.2.8v_RC366 (HYPER_V).

Weakness: CWE-327

Which versions are affected by CVE-2019-7477?

It affects 2 products.

Products include Sonicwall Sonicos, Sonicwall Sonicosv.

How do I fix CVE-2019-7477?

No fix has been published for CVE-2019-7477 yet. Limit exposure of the affected software until one is available.

Is CVE-2019-7477 being exploited?

There is no known exploitation of CVE-2019-7477 in the wild and no public exploit code.

Other vulnerabilities in Sonicwall Sonicos

• CVE-2020-5135 SonicWall SonicOS Buffer Overflow Exploited Critical 9.8
• CVE-2024-40766 SonicWall SonicOS Improper Access Control Exploited Critical 9.3
• CVE-2024-53704 SonicWall SonicOS SSLVPN Improper Authentication Exploited High 8.2
• CVE-2025-40600 Denial of service in SonicOS Critical 9.8
• CVE-2024-22394 Auth bypass in SonicOS Critical 9.8

All Sonicwall Sonicos vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-cf3p-cffq-p3vj.