Unauthenticated code execution via overlong SIP Replaces header
Published Jan 23, 2026 · Updated Jan 23, 2026
Stack-based buffer overflow in Algo 8180 IP Audio Alerter 5.5 allows remote attackers to execute arbitrary code through a SIP INVITE request. The Replaces-header handler copies attacker-controlled data into a fixed-length stack buffer without first validating its length. No authentication or user interaction is required, and successful exploitation runs code in the device context.
Summary
What happened
Stack-based buffer overflow in Algo 8180 IP Audio Alerter 5.5 allows remote attackers to execute arbitrary code through a SIP INVITE request. The Replaces-header handler copies attacker-controlled data into a fixed-length stack buffer without first validating its length. No authentication or user interaction is required, and successful exploitation runs code in the device context.
The record
- CVE
- CVE-2026-0791
- Published
- Jan 23, 2026
- Updated
- Jan 23, 2026
- Vendor
- Algo Communication Products Ltd.
- Product
- 8180 IP Audio Alerter
- Classifications
- CWE-787, CWE-121, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 23, 2026CVE publishedPublication date reported by the CVE source.
- Jan 23, 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.
- Affected versionversion=5.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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