Kyverno vulnerable due to usage of insecure cipher

### Summary Insecure 3DES ciphers are used which may lead to exploitation of the [Sweet32 vulnerability](https://sweet32.info/). Specifically, the ciphers TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA (secp256r1) and TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) are allowed. See CVE-2016-2183. This is fixed in Kyverno v1.9.5 and v1.10.0 and no known users have been affected. ### Details The ciphers in affected versions can be read using the following command which uses `nmap`: ```sh $ kubectl exec -it mypod -n kyverno sh kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead. **nmap -sV --script ssl-enum-ciphers -p 443 kyverno-cleanup-controller** or **nmap -sV --script ssl-enum-ciphers -p 443 kyverno-svc** Starting Nmap 7.92 ( https://nmap.org ) at 2023-05-26 10:55 UTC Nmap scan report for kyverno-cleanup-controller (10.103.199.233) Host is up (0.000058s latency). rDNS record for 10.103.199.233: kyverno-cleanup-controller.kyverno.svc.cluster.local PORT STATE SERVICE VERSION 443/tcp open ssl/http Golang net/http server (Go-IPFS json-rpc or InfluxDB API) | ssl-enum-ciphers: | TLSv1.2: | ciphers: **| TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA (secp256r1) - C** | TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A | TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A | TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (secp256r1) - A **| TLS_RSA_WITH_3DES_EDE_CBC_SHA (rsa 2048) - C** | TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A | TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A | TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A | TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A | compressors: | NULL | cipher preference: client | warnings: | 64-bit block cipher 3DES vulnerable to SWEET32 attack | TLSv1.3: | ciphers: | TLS_AKE_WITH_AES_128_GCM_SHA256 (ecdh_x25519) - A | TLS_AKE_WITH_AES_256_GCM_SHA384 (ecdh_x25519) - A | TLS_AKE_WITH_CHACHA20_POLY1305_SHA256 (ecdh_x25519) - A | cipher preference: server |_ least strength: C Service detection performed. Please report any incorrect results at https://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 12.72 seconds ```

Source published

30 May 2023 20:07:06 UTC

Source modified

14 Oct 2026 11:10:48 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

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