CVE-2020-5423: CAPI (Cloud Controller) versions prior to 1.101.0 are vulnerable to a denial-of-service attack in which an una

Q: How do I fix CVE-2020-5423?

capi-release: upgrade to 1.101.0; cf-deployment: upgrade to 15.0.0. Exact commands for each OS are on this page.

Q: Is CVE-2020-5423 being exploited?

CVE-2020-5423 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-5423 affect?

CVE-2020-5423 affects capi-release, cf-deployment. Severity is high (CVSS 7.5). CAPI (Cloud Controller) versions prior to 1.101.0 are vulnerable to a denial-of-service attack in which an unauthenticated malicious attacker can send specially-crafted YAML files to certain endpoints, causing the YAML parser to consume exc

Q: How urgent is CVE-2020-5423?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2020-5423 is a high-severity flaw (CVSS 7.5) affecting capi-release, cf-deployment. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CAPI (Cloud Controller) versions prior to 1.101.0 are vulnerable to a denial-of-service attack in which an unauthenticated malicious attacker can send specially-crafted YAML files to certain endpoints, causing the YAML parser to consume excessive CPU and RAM.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 33%)
CISA exploited list	No
Weakness	CWE-400
Published	2020-12-02
Last modified	2026-06-17

Publisher (CNA): Pivotal Software, Inc. · Vendor: cloudfoundry

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

Am I affected?

Timeline

2020-12-02 02:15 UTCPublished CVE record published
2026-06-17 03:21 UTCUpdated Record last modified

cloudfoundry capi-release UPGRADE

Affected: < 1.101.0

Fixed in: 1.101.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.101.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade capi-release

Note

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

cloudfoundry cf-deployment UPGRADE

Affected: < 15.0.0

Fixed in: 15.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 15.0.0 (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.

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-2020-5423?

capi-release: upgrade to 1.101.0; cf-deployment: upgrade to 15.0.0. Exact commands for each OS are on this page.

Is CVE-2020-5423 being exploited?

CVE-2020-5423 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-2020-5423 affect?

CVE-2020-5423 affects capi-release, cf-deployment. Severity is high (CVSS 7.5). CAPI (Cloud Controller) versions prior to 1.101.0 are vulnerable to a denial-of-service attack in which an unauthenticated malicious attacker can send specially-crafted YAML files to certain endpoints, causing the YAML parser to consume exc

How urgent is CVE-2020-5423?

Priority 48/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-20881 HIGH 8.1 UPGRADE UPGRADE Cloud foundry instances having CAPI version between 1.140 and 1.152.0 along with loggregator-agent v7+ may ove
CVE-2021-22115 MEDIUM 6.5 UPGRADE UPGRADE Cloud Controller API versions prior to 1.106.0 logs service broker credentials if the default value of db logg
CVE-2021-22101 HIGH 7.5 UPGRADE UPGRADE Cloud Controller versions prior to 1.118.0 are vulnerable to unauthenticated denial of Service(DoS) vulnerabil
CVE-2021-22100 MEDIUM 5.3 UPGRADE UPGRADE In cloud foundry CAPI versions prior to 1.122, a denial-of-service attack in which a developer can push a serv
CVE-2020-5418 MEDIUM 4.3 UPGRADE UPGRADE Cloud Foundry CAPI (Cloud Controller) versions prior to 1.98.0 allow authenticated users having only the "clou

References

← Back to latest CVEs