An issue was discovered in Open vSwitch (OvS) 2.7.x through 2.7.6, affecting ofproto_rule_insert__ in ofproto/ofproto.c.
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.
- Published
- Sep 19, 2018
- Updated
- Jun 16, 2026
- EPSS
- 2.5% · 84th percentile
- CWE
- CWE-617
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| openvswitch | openvswitch | cpe:2.3:a:openvswitch:openvswitch |
| redhat | openstack | cpe:2.3:a:redhat:openstack |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- openvswitch openvswitch2.7.0 and later · up to 2.7.6 inclusive
- redhat openstack10
- redhat openstack13
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | openvswitch | before 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 | 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 |
| Red Hat:enterprise_linux:7::fastdatapath | openvswitch-ovn-central | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::fastdatapath | openvswitch-ovn-vtep | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::fastdatapath | openvswitch-test | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::hypervisor | openvswitch | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::hypervisor | openvswitch-debuginfo | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::hypervisor | openvswitch-devel | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::hypervisor | openvswitch-ovn-common | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::hypervisor | openvswitch-ovn-host | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:enterprise_linux:7::hypervisor | python-openvswitch | before 0:2.9.0-70.el7fdp.1 | 0:2.9.0-70.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-debuginfo | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-devel | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-ovn-central | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-ovn-common | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-ovn-host | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-ovn-vtep | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | openvswitch-test | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| Red Hat:openstack:10::el7 | python-openvswitch | before 0:2.9.0-83.el7fdp.1 | 0:2.9.0-83.el7fdp.1 |
| SUSE:Linux Enterprise Server 12 SP3 | openvswitch | before 2.7.6-3.23.1 | 2.7.6-3.23.1 |
Same product
openvswitch: all recordsOther highest-scoring records for the same primary product.
- CVE-2016-2074Buffer overflow in lib/flow.c in ovs-vswitchd in Open vSwitch 2.2.x and 2.3.x before 2.3.3 and 2.4.x before 2.4.1 allows remote attackers to41Plan
- CVE-2017-9265In Open vSwitch (OvS) v2.7.0, there is a buffer over-read while parsing the group mod OpenFlow message sent from the controller in `lib/ofp-40Plan
- CVE-2017-9264In lib/conntrack.c in the firewall implementation in Open vSwitch (OvS) 2.6.1, there is a buffer over-read while parsing malformed TCP, UDP,40Plan
- CVE-2017-9214In Open vSwitch (OvS) 2.7.0, while parsing an OFPT_QUEUE_GET_CONFIG_REPLY type OFP 1.0 message, there is a buffer over-read that is caused b40Plan
- CVE-2022-4338An integer underflow in Organization Specific TLV was found in various versions of OpenvSwitch.39Monitor
- CVE-2022-4337An out-of-bounds read in Organization Specific TLV was found in various versions of OpenvSwitch.39Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:openvswitch | 2.10.0+2018.08.28+git.8ca7c82b7d+ds1-1 · Debian:12 | Package registry (OSV) |
| red hat:openvswitch | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:openvswitch-debuginfo | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:openvswitch-devel | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:openvswitch-ovn-central | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::fastdatapath | Package registry (OSV) |
| red hat:openvswitch-ovn-common | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:openvswitch-ovn-host | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| red hat:openvswitch-ovn-vtep | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::fastdatapath | Package registry (OSV) |
| red hat:openvswitch-test | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::fastdatapath | Package registry (OSV) |
| red hat:python-openvswitch | 0:2.9.0-70.el7fdp.1 · Red Hat:enterprise_linux:7::hypervisor | Package registry (OSV) |
| suse:openvswitch | 2.7.6-3.23.1 · SUSE:Linux Enterprise Server 12 SP3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-617 · Reachable AssertionCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- access.redhat.com/errata/RHSA-2018:3500
- access.redhat.com/errata/RHSA-2019:0053
- access.redhat.com/errata/RHSA-2019:0081
- usn.ubuntu.com/3873-1/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.