CVE-2018-11574: Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may

Q: How do I fix CVE-2018-11574?

point-to-point protocol: upgrade to 2.4.9; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-11574 being exploited?

CVE-2018-11574 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-2018-11574 affect?

CVE-2018-11574 affects point-to-point protocol, ubuntu linux. Severity is critical (CVSS 9.8). Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may cause a crash, information disclosure, or authentication bypass. This implementation is distributed as a patch for PPPD 0.91, and

Q: How urgent is CVE-2018-11574?

Priority 64/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.8REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2018-11574 is a critical-severity flaw (CVSS 9.8) affecting point-to-point protocol, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may cause a crash, information disclosure, or authentication bypass. This implementation is distributed as a patch for PPPD 0.91, and includes the affected eap.c and eap-tls.c files. Configurations that use the `refuse-app` option are unaffected.

Why this priority

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

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 21%)
CISA exploited list	No
Weakness	CWE-20, CWE-190
Published	2018-06-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canonical · point-to-point protocol project

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

Am I affected?

Timeline

2018-06-14 20:29 UTCPublished CVE record published
2026-06-17 01:36 UTCUpdated Record last modified

point-to-point protocol project point-to-point protocol UPGRADE

Affected: < 2.4.9

Fixed in: 2.4.9

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy point-to-point-protocol || rpm -q point-to-point-protocol || point-to-point-protocol --version

2. UPGRADE to 2.4.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade point-to-point-protocol

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade point-to-point-protocol

Note

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

canonical ubuntu linux MITIGATE

Affected: 14.04 · 16.04 · 18.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

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-2018-11574?

point-to-point protocol: upgrade to 2.4.9; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-11574 being exploited?

CVE-2018-11574 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-2018-11574 affect?

CVE-2018-11574 affects point-to-point protocol, ubuntu linux. Severity is critical (CVSS 9.8). Improper input validation together with an integer overflow in the EAP-TLS protocol implementation in PPPD may cause a crash, information disclosure, or authentication bypass. This implementation is distributed as a patch for PPPD 0.91, and

How urgent is CVE-2018-11574?

Priority 64/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Ubuntu vulnerabilities

Related CVEs

CVE-2020-8597 CRITICAL 9.8 UPGRADE MITIGATE eap.c in pppd in ppp 2.4.2 through 2.4.8 has an rhostname buffer overflow in the eap_request and eap_response
CVE-2015-3310 MEDIUM 4.3 MITIGATE MITIGATE Buffer overflow in the rc_mksid function in plugins/radius/util.c in Paul's PPP Package (ppp) 2.4.6 and earlie
CVE-2014-3158 HIGH 7.5 UPGRADE Integer overflow in the getword function in options.c in pppd in Paul's PPP Package (ppp) before 2.4.7 allows

References

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