CVE-2017-5878: The AMF unmarshallers in Red5 Media Server before 1.0.8 do not restrict the classes for which it performs dese

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CRITICAL 9.8REMOTEMITIGATE

CVE-2017-5878 is a critical-severity flaw (CVSS 9.8) affecting media server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The AMF unmarshallers in Red5 Media Server before 1.0.8 do not restrict the classes for which it performs deserialization, which allows remote attackers to execute arbitrary code via crafted serialized Java data.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.7% (top 14%)
CISA exploited list	No
Weakness	CWE-502
Published	2017-06-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: red5

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

Am I affected?

Timeline

2017-06-08 16:29 UTCPublished CVE record published
2026-06-17 01:21 UTCUpdated Record last modified

red5 media server MITIGATE

Affected: 1.0.2 · 1.0.2 milestone1 · 1.0.3 · 1.0.4 · 1.0.5 · 1.0.6 · 1.0.7 · 1.0.7 milestone1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2017-5878?

media server: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-5878 being exploited?

CVE-2017-5878 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-2017-5878 affect?

CVE-2017-5878 affects media server. Severity is critical (CVSS 9.8). The AMF unmarshallers in Red5 Media Server before 1.0.8 do not restrict the classes for which it performs deserialization, which allows remote attackers to execute arbitrary code via crafted serialized Java data.

How urgent is CVE-2017-5878?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Java vulnerabilities

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References

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