CVE-2013-7098: OpenConnect VPN client with GnuTLS before 5.02 contains a heap overflow if MTU is increased on reconnection.

Q: How do I fix CVE-2013-7098?

openconnect: upgrade to 5.02. Exact commands for each OS are on this page.

Q: Is CVE-2013-7098 being exploited?

CVE-2013-7098 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-2013-7098 affect?

CVE-2013-7098 affects openconnect. Severity is critical (CVSS 9.8). OpenConnect VPN client with GnuTLS before 5.02 contains a heap overflow if MTU is increased on reconnection.

Q: How urgent is CVE-2013-7098?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2013-7098 is a critical-severity flaw (CVSS 9.8) affecting openconnect. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenConnect VPN client with GnuTLS before 5.02 contains a heap overflow if MTU is increased on reconnection.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

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	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-787
Published	2020-02-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: infradead

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

Am I affected?

Timeline

2020-02-13 23:15 UTCPublished CVE record published
2026-06-17 00:01 UTCUpdated Record last modified

infradead openconnect UPGRADE

Affected: < 5.02

Fixed in: 5.02

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 5.02 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openconnect

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-2013-7098?

openconnect: upgrade to 5.02. Exact commands for each OS are on this page.

Is CVE-2013-7098 being exploited?

CVE-2013-7098 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-2013-7098 affect?

CVE-2013-7098 affects openconnect. Severity is critical (CVSS 9.8). OpenConnect VPN client with GnuTLS before 5.02 contains a heap overflow if MTU is increased on reconnection.

How urgent is CVE-2013-7098?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

GnuTLS vulnerabilities

Related CVEs

CVE-2020-12823 CRITICAL 9.8 DOWNGRADE MITIGATE OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecifie
CVE-2020-12105 MEDIUM 5.9 UPGRADE MITIGATE OpenConnect through 8.08 mishandles negative return values from X509_check_ function calls, which might assist

References

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