CVE-2013-7098Network attack vector

Client memory corruption via increased reconnect MTU

Published Feb 13, 2020 · Updated Aug 6, 2024

Heap overflow in OpenConnect's GnuTLS client before 5.02 allows attackers to corrupt client memory when a reconnect raises the MTU. The GnuTLS reconnect path fails to resize its heap buffer after adopting the larger MTU, so a packet at the new size exceeds the prior allocation. Triggering requires a VPN reconnection that negotiates a higher MTU; the resulting out-of-bounds write can crash the client.

CVSS severity9.8
Critical
EPSS probability1.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in OpenConnect's GnuTLS client before 5.02 allows attackers to corrupt client memory when a reconnect raises the MTU. The GnuTLS reconnect path fails to resize its heap buffer after adopting the larger MTU, so a packet at the new size exceeds the prior allocation. Triggering requires a VPN reconnection that negotiates a higher MTU; the resulting out-of-bounds write can crash the client.

The record

CVE
CVE-2013-7098
Published
Feb 13, 2020
Updated
Aug 6, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 13, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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