CVE-2025-66373: Akamai Ghost on Akamai CDN edge servers before 2025-11-17 has a chunked request body processing error that can

Q: How do I fix CVE-2025-66373?

akamaighost: upgrade to 2025-11-17. Exact commands for each OS are on this page.

Q: Is CVE-2025-66373 being exploited?

CVE-2025-66373 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-2025-66373 affect?

CVE-2025-66373 affects akamaighost. Severity is medium (CVSS 4.8). Akamai Ghost on Akamai CDN edge servers before 2025-11-17 has a chunked request body processing error that can result in HTTP request smuggling. When Akamai Ghost receives an invalid chunked body that includes a chunk size different from th

Q: How urgent is CVE-2025-66373?

Priority 26/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 4.8REMOTEUPGRADE

CVE-2025-66373 is a medium-severity flaw (CVSS 4.8) affecting akamaighost. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Akamai Ghost on Akamai CDN edge servers before 2025-11-17 has a chunked request body processing error that can result in HTTP request smuggling. When Akamai Ghost receives an invalid chunked body that includes a chunk size different from the actual size of the following chunk data, under certain circumstances, Akamai Ghost erroneously forwards the invalid request and subsequent superfluous bytes to the origin server. An attacker could hide a smug

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	4.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-444
Published	2025-12-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: akamai

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

Am I affected?

Timeline

2025-12-04 17:15 UTCPublished CVE record published
2026-06-17 09:56 UTCUpdated Record last modified

akamai akamaighost UPGRADE

Affected: < 2025-11-17

Fixed in: 2025-11-17

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2025-11-17 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade akamaighost

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade akamaighost

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-2025-66373?

akamaighost: upgrade to 2025-11-17. Exact commands for each OS are on this page.

Is CVE-2025-66373 being exploited?

CVE-2025-66373 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-2025-66373 affect?

CVE-2025-66373 affects akamaighost. Severity is medium (CVSS 4.8). Akamai Ghost on Akamai CDN edge servers before 2025-11-17 has a chunked request body processing error that can result in HTTP request smuggling. When Akamai Ghost receives an invalid chunked body that includes a chunk size different from th

How urgent is CVE-2025-66373?

Priority 26/100. Remotely exploitable, no login, no user action

References

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