CVE-2021-34706Network attack vector

Authenticated file disclosure and SSRF via XXE

Published Oct 6, 2021 · Updated Nov 7, 2024

XXE in Cisco Identity Services Engine 3.1 and earlier allows remote authenticated users to read local files or make arbitrary HTTP requests. The web management interface parses uploaded XML files without blocking external entity references, so crafted entities resolve local paths or attacker-selected URLs. Exploitation requires valid interface credentials and exposes local file contents or makes the appliance issue attacker-directed requests.

CVSS severity6.4
Medium
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XXE in Cisco Identity Services Engine 3.1 and earlier allows remote authenticated users to read local files or make arbitrary HTTP requests. The web management interface parses uploaded XML files without blocking external entity references, so crafted entities resolve local paths or attacker-selected URLs. Exploitation requires valid interface credentials and exposes local file contents or makes the appliance issue attacker-directed requests.

The record

CVE
CVE-2021-34706
Published
Oct 6, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-611
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 6, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 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 Identity Services Engineversion=n/a

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
5.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:N
6.4Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-611Improper Restriction of XML External Entity Reference

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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