CVE-2023-20882: In Cloud foundry routing release versions from 0.262.0 and prior to 0.266.0,a bug in the gorouter process can

Routine

MEDIUM 5.9REMOTEUPGRADEUPGRADE

CVE-2023-20882 is a medium-severity flaw (CVSS 5.9) affecting cf-deployment, routing release. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In Cloud foundry routing release versions from 0.262.0 and prior to 0.266.0,a bug in the gorouter process can lead to a denial of service of applications hosted on Cloud Foundry. Under the right circumstances, when client connections are closed prematurely, gorouter marks the currently selected backend as failed and removes it from the routing pool.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-400
Published	2023-05-26
Last modified	2026-06-17

Publisher (CNA): VMware · Vendor: cloudfoundry

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

Am I affected?

Timeline

2023-05-26 17:15 UTCPublished CVE record published
2026-06-17 05:31 UTCUpdated Record last modified

cloudfoundry cf-deployment UPGRADE

Affected: >= 27.4.0 and < 29.0.0

Fixed in: 29.0.0

Safe to downgrade to: a release before 27.4.0

1. Check installed version

apt-cache policy cf-deployment || rpm -q cf-deployment || cf-deployment --version

2. UPGRADE to 29.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cf-deployment

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cf-deployment

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 27.4.0 (Debian / Ubuntu)

apt-cache madison cf-deployment sudo apt install cf-deployment=<VERSION_BEFORE_27.4.0> sudo apt-mark hold cf-deployment

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cf-deployment sudo dnf downgrade cf-deployment-<VERSION_BEFORE_27.4.0> sudo dnf versionlock add cf-deployment

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.

cloudfoundry routing release UPGRADE

Affected: >= 0.262.0 and < 0.266.0

Fixed in: 0.266.0

Safe to downgrade to: a release before 0.262.0

1. Check installed version

apt-cache policy routing-release || rpm -q routing-release || routing-release --version

2. UPGRADE to 0.266.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade routing-release

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade routing-release

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.262.0 (Debian / Ubuntu)

apt-cache madison routing-release sudo apt install routing-release=<VERSION_BEFORE_0.262.0> sudo apt-mark hold routing-release

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list routing-release sudo dnf downgrade routing-release-<VERSION_BEFORE_0.262.0> sudo dnf versionlock add routing-release

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-2023-20882?

cf-deployment: upgrade to 29.0.0; routing release: upgrade to 0.266.0. Exact commands for each OS are on this page.

Is CVE-2023-20882 being exploited?

CVE-2023-20882 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-2023-20882 affect?

CVE-2023-20882 affects cf-deployment, routing release. Severity is medium (CVSS 5.9). In Cloud foundry routing release versions from 0.262.0 and prior to 0.266.0,a bug in the gorouter process can lead to a denial of service of applications hosted on Cloud Foundry. Under the right circumstances, when client connections are cl

How urgent is CVE-2023-20882?

Priority 38/100. Remotely exploitable, no login, no user action

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References

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