CVE-2026-40118Network attack vector

Information disclosure via redirected offline activation traffic

Published Apr 16, 2026 · Updated Apr 16, 2026

Information disclosure in Arcserve UDP Console 10.3 allows remote attackers to receive offline activation traffic sent to a dummy URL. The offline activation workflow sends traffic to the configured activation-server hostname without ensuring that it is the intended destination. Exploitation requires a user to set that hostname to an attacker-controlled dummy domain; published details do not identify the exposed data.

CVSS severity5.1
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Arcserve UDP Console 10.3 allows remote attackers to receive offline activation traffic sent to a dummy URL. The offline activation workflow sends traffic to the configured activation-server hostname without ensuring that it is the intended destination. Exploitation requires a user to set that hostname to an attacker-controlled dummy domain; published details do not identify the exposed data.

The record

CVE
CVE-2026-40118
Published
Apr 16, 2026
Updated
Apr 16, 2026
Vendor
Arcserve
Product
Arcserve UDP Console
Classifications
CWE-941
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2026Record 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=10.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Arcserve · Arcserve UDP Consoleversion=10.3

Published CVSS scores

6.3JPCERT/CCCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
5.1JPCERT/CCCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

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 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-941Incorrectly Specified Destination in a Communication Channel

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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