CVE-2020-3310Network attack vector

Authenticated parser crash via unhardened XML configuration

Published May 6, 2020 · Updated Nov 15, 2024

XML parser denial of service in Cisco Firepower Threat Defense before 6.2.3 allows remote authenticated users to crash the parser. The Firepower Device Manager On-Box parser uses an insufficiently hardened XML configuration when processing a malicious uploaded or VPN-delivered file. Administrative upload privileges or Clientless SSL VPN access are required; exploitation exhausts memory, destabilizes the system, and can reload the device.

CVSS severity5.5
Medium
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XML parser denial of service in Cisco Firepower Threat Defense before 6.2.3 allows remote authenticated users to crash the parser. The Firepower Device Manager On-Box parser uses an insufficiently hardened XML configuration when processing a malicious uploaded or VPN-delivered file. Administrative upload privileges or Clientless SSL VPN access are required; exploitation exhausts memory, destabilizes the system, and can reload the device.

The record

CVE
CVE-2020-3310
Published
May 6, 2020
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco Firepower Threat Defense
Classifications
CWE-119, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Firepower Threat Defenseversion=n/a

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
6.8NIST NVDAV:N/AC:L/Au:S/C:N/I:N/A:C
5.5Cisco Systems, Inc.CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:L/E:X/RL:X/RC:X

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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