# testssl/testssl.sh

Testing TLS/SSL encryption anywhere on any port

Repository: https://github.com/testssl/testssl.sh
Canonical: https://ross.abutalabs.com/products/testsslsh
Homepage: https://testssl.sh
Language: Shell
License: GPL-2.0
License Family: copyleft
Topics: tls, cipher, openssl, ct, ssl, pqcrypto, quic, http-header, kem, client-simulation, csv, json, ipv6
Last push: 2026-08-24T17:49:55+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 68, longevity 100
- inputs: {"age_days": 4446, "days_push": 9, "days_rel": 52, "gap_med": 91.5, "n_releases_24m": 7}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 9181, forks 1143 (observed 2026-08-28T04:10:28.757141+00:00)

## What it is
testssl.sh is a free, bash-based command line tool that checks any server's service on any port for TLS/SSL cipher, protocol, and cryptographic flaw support. It requires no installation or dependencies, works across Linux, macOS, BSD, and WSL2/Cygwin, and outputs human-readable plus machine-readable (CSV, JSON, HTML) results.

## Use cases
- audit a web server's TLS/SSL configuration for weak ciphers and protocols
- check for cryptographic flaws like Bleichenbacher on any STARTTLS service
- scan TLS on non-standard ports, not just 443
- generate machine-readable JSON/CSV reports of SSL scan results for CI pipelines
- test servers for post-quantum key exchange and QUIC support
- quickly check TLS config from a pentest box without installing dependencies

## When to choose
- you need a zero-install, single-script TLS scanner that runs anywhere bash runs
- you want clear pass/fail output plus JSON/CSV for automation
- you need to test STARTTLS services (SMTP, IMAP, etc.) or arbitrary ports
- you want thorough, well-maintained checks of protocols, ciphers, and flaws

## When to avoid
- you need a full web application vulnerability scanner rather than TLS-specific testing
- you want a GUI or continuous certificate monitoring service
- your environment has no bash or POSIX shell available

## Facets
- artifact type: cli-tool
- maturity: active
- function: security, vulnerability-scanning, cli, testing
- domain: security, developer-tools, networking
- platform: windows, bsd, cli, cross-platform
- tags: tls, ssl, openssl, pentesting, cipher-scanning, quic, post-quantum, shell-script, csv-output, json-output, client-simulation, command-line, linux, macos, docker

## Member repositories
- testssl/testssl.sh (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:28.757141+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:23:21.088923+00:00, confidence not recorded.
  - readme: https://github.com/testssl/testssl.sh (fetched 2026-08-28T04:10:28.757141+00:00, sha 3ba154d9e645)
  - homepage: https://testssl.sh (fetched 2026-08-29T08:23:22.744030+00:00, sha c203aa57c6e3)
- Data as of 2026-08-30T08:39:29.467469+00:00.