CVE-2026-19745Network attack vector

Authenticated service interruption via manipulated session key

Published Aug 13, 2026 · Updated Aug 13, 2026

Denial of service in Calix GigaSpire 26.1.0 allows remote authenticated users to interrupt its Web Management Interface. The utilities_configurationsave.cgi handler accepts a manipulated sessionKey, but the exact resource-handling failure is undisclosed. Low-privileged Web Management Interface access is required; the published record reports only an availability impact and does not identify whether the interface hangs, crashes, or reboots.

CVSS severityUnavailable
Unscored
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Calix GigaSpire 26.1.0 allows remote authenticated users to interrupt its Web Management Interface. The utilities_configurationsave.cgi handler accepts a manipulated sessionKey, but the exact resource-handling failure is undisclosed. Low-privileged Web Management Interface access is required; the published record reports only an availability impact and does not identify whether the interface hangs, crashes, or reboots.

The record

CVE
CVE-2026-19745
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Calix
Product
GigaSpire
Classifications
CWE-404, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 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=26.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Calix · GigaSpireversion=26.1.0

Published CVSS scores

4.3VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
4.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
4.0VulDBAV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR

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-404Improper Resource Shutdown or Release
T1499.004Application or System Exploitation

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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