CVE-2015-4680: FreeRADIUS 2.2.x before 2.2.8 and 3.0.x before 3.0.9 does not properly check revocation of intermediate CA cer

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HIGH 7.5REMOTEWATCHLISTDOWNGRADEMITIGATEMITIGATE

CVE-2015-4680 is a high-severity flaw (CVSS 7.5) affecting freeradius, linux enterprise server, linux enterprise software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

FreeRADIUS 2.2.x before 2.2.8 and 3.0.x before 3.0.9 does not properly check revocation of intermediate CA certificates.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

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	1.8% (top 22%)
CISA exploited list	No
Weakness	CWE-295
Published	2017-04-05
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: freeradius · suse

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

Am I affected?

Timeline

2017-04-05 17:59 UTCPublished CVE record published
2026-06-17 00:27 UTCUpdated Record last modified

freeradius freeradius DOWNGRADE

Affected: 3.0.0 · 3.0.1 · 3.0.2 · 3.0.3 · 3.0.4 · 3.0.5 · 3.0.6 · 3.0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.2.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 2.2.0 (Debian / Ubuntu)

apt-cache madison freeradius sudo apt install freeradius=<VERSION_BEFORE_2.2.0> sudo apt-mark hold freeradius

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

dnf --showduplicates list freeradius sudo dnf downgrade freeradius-<VERSION_BEFORE_2.2.0> sudo dnf versionlock add freeradius

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.

suse linux enterprise server MITIGATE

Affected: 12 sp1 · 12 sp2

Fixed in: no fixed release known

Safe to downgrade to: a release before 12

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.

suse linux enterprise software development kit MITIGATE

Affected: 12 sp1 · 12 sp2

Fixed in: no fixed release known

Safe to downgrade to: a release before 12

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-2015-4680?

freeradius: downgrade or apply the listed mitigation; linux enterprise server: mitigate or apply the listed mitigation; linux enterprise software development kit: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-4680 being exploited?

CVE-2015-4680 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-2015-4680 affect?

CVE-2015-4680 affects freeradius, linux enterprise server, linux enterprise software development kit. Severity is high (CVSS 7.5). FreeRADIUS 2.2.x before 2.2.8 and 3.0.x before 3.0.9 does not properly check revocation of intermediate CA certificates.

How urgent is CVE-2015-4680?

Priority 56/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

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References

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