# CVE-2019-7477: Weak cryptography in SonicOS

> Remote attackers can decrypt sensitive data if CBC cipher suites are enabled in SonicWall SonicOS, requiring configuration changes to disable them.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Apr 2019
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-cf3p-cffq-p3vj

## 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 (Use of a Broken or Risky Cryptographic Algorithm)

## Which versions are affected by CVE-2019-7477?

It affects 2 products.


Products: 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](https://insights.sbomify.com/CVE-2020-5135/): SonicWall SonicOS Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2024-40766](https://insights.sbomify.com/CVE-2024-40766/): SonicWall SonicOS Improper Access Control (critical 9.3, exploited in the wild)
- [CVE-2024-53704](https://insights.sbomify.com/CVE-2024-53704/): SonicWall SonicOS SSLVPN Improper Authentication (high 8.2, exploited in the wild)
- [CVE-2025-40600](https://insights.sbomify.com/CVE-2025-40600/): Denial of service in SonicOS (critical 9.8)
- [CVE-2024-22394](https://insights.sbomify.com/CVE-2024-22394/): Auth bypass in SonicOS (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-7477 and fix it if it is affected.

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

Affected product: Sonicwall Sonicos. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-7477/ (Markdown: https://insights.sbomify.com/CVE-2019-7477/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-7477
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-7477
- OSV: https://osv.dev/vulnerability/CVE-2019-7477

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-7477/
Summaries are generated and may contain mistakes; the official description above is the record.