---
title: "NET-TLS-001 Deprecated TLS 1.0 or 1.1 Accepted"
canonical: https://openvapt.com/checks/NET-TLS-001.html
html: https://openvapt.com/checks/NET-TLS-001.html
site: OpenVAPT, https://openvapt.com/
license: OpenVAPT Source-Available Licence 1.3, https://openvapt.com/legal/licence-text.html
modified: 2026-10-14
version: 0.1.0-alpha.6
---

# NET-TLS-001 Deprecated TLS 1.0 or 1.1 Accepted

Checks whether local TLS services still accept TLS 1.0 or TLS 1.1.

- Domain: Network
- Severity: Medium
- Control category: Cryptography and TLS
- Fix effort: low
- CVSS v3.1 vector: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`
- CIS Controls v8: 3.10
- NIST CSF 2.0: PR.DS-02
- CWE: CWE-326, CWE-327
- OWASP Top 10 2021: A02:2021
- OWASP ASVS 4.0.3: 9.1.3
- OWASP WSTG v4.2: WSTG-CRYP-01
- NIST SP 800-53 Rev. 5: SC-8, SC-13
- Benchmark topic: TLS protocol versions (topic only, no benchmark text)

## Why It Matters

TLS 1.0 and 1.1 were formally deprecated by RFC 8996 in 2021. They rely on outdated constructions (e.g. SHA-1 in the handshake) and fail PCI DSS and most compliance baselines.

## How It Detects

For each local TLS port and site name, attempts a handshake with 127.0.0.1 limited to TLS 1.0 only, then TLS 1.1 only. A completed handshake fails the check.

## How to Fix

Apache: SSLProtocol -all +TLSv1.2 +TLSv1.3 . nginx: ssl_protocols TLSv1.2 TLSv1.3; . Postfix/Dovecot: set the minimum protocol to TLSv1.2. Reload the service afterwards.

## How to Verify

```
openssl s_client -connect 127.0.0.1:443 -tls1_1 </dev/null  should fail to connect.
```

## Learn the Theory

- [P4 TLS, Certificates and HTTPS](https://openvapt.com/academy/p4.md)

## References

- [RFC 8996, Deprecating TLS 1.0 and TLS 1.1](https://www.rfc-editor.org/rfc/rfc8996.html)
- [NIST SP 800-52 Rev. 2, Guidelines for TLS Implementations](https://csrc.nist.gov/pubs/sp/800/52/r2/final)
- [Mozilla Server Side TLS guidelines](https://wiki.mozilla.org/Security/Server_Side_TLS)

## Source Code

https://github.com/OpenVAPT/openvapt/blob/574f7f3333c44b75a3c649e2d93a76d507f75adf/internal/checks/network/tls.go

Run it: `openvapt scan --only NET-TLS-001`. Read it offline: `openvapt explain NET-TLS-001`.

---

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