CVE-2025-29311: Limited secret space in LLDP packets used in onos v2.7.0 allows attackers to obtain the private key via a brut

Routine

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-29311 is a high-severity flaw (CVSS 7.5) affecting onos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Limited secret space in LLDP packets used in onos v2.7.0 allows attackers to obtain the private key via a bruteforce attack. Attackers are able to leverage this vulnerability into creating crafted LLDP packets.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Weakness	CWE-331
Published	2025-03-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: opennetworking

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-03-24 21:15 UTCPublished CVE record published
2026-06-17 09:05 UTCUpdated Record last modified

opennetworking onos DOWNGRADE

Affected: 2.7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.7.0

1. Check installed version

apt-cache policy onos || rpm -q onos || onos --version

2. No fixed release: DOWNGRADE to a release before 2.7.0 (Debian / Ubuntu)

apt-cache madison onos sudo apt install onos=<VERSION_BEFORE_2.7.0> sudo apt-mark hold onos

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list onos sudo dnf downgrade onos-<VERSION_BEFORE_2.7.0> sudo dnf versionlock add onos

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-29311?

onos: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-29311 being exploited?

CVE-2025-29311 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-29311 affect?

CVE-2025-29311 affects onos. Severity is high (CVSS 7.5). Limited secret space in LLDP packets used in onos v2.7.0 allows attackers to obtain the private key via a bruteforce attack. Attackers are able to leverage this vulnerability into creating crafted LLDP packets.

How urgent is CVE-2025-29311?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2025-29312 CRITICAL 9.1 DOWNGRADE An issue in onos v2.7.0 allows attackers to trigger unexpected behavior within a device connected to a legacy
CVE-2025-29310 CRITICAL 9.8 DOWNGRADE An issue in onos v2.7.0 allows attackers to trigger a packet deserialization problem when supplying a crafted
CVE-2024-53423 MEDIUM 5.6 DOWNGRADE An issue in Open Network Foundation ONOS v2.7.0 allows attackers to cause a Denial of Service (DoS) via supply
CVE-2023-41591 CRITICAL 9.8 DOWNGRADE An issue in Open Network Foundation ONOS v2.7.0 allows attackers to create fake IP/MAC addresses and potential

References

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