⚠ Reference material — not professional advice. Test in staging, back up first, verify against your specific version. Use your own judgment for your environment.
● High · CVSS 8.1

How to Fix CVE-2026-0791: Stack Buffer Overflow in 8180 IP Audio Alerter

Other vulnerabilities in the same area that are worth patching alongside this one:

*By Sai Kiran Pandrala*

⚡ At a glance
SeverityCVSS 8.1 - High
Actively exploited?Not currently listed in CISA KEV
Affected5.5
Fixed inSee vendor advisory
Type (CWE)CWE-121: Stack-based Buffer Overflow

What is CVE-2026-0791?

CVE-2026-0791 is a stack-based buffer overflow in 8180 IP Audio Alerter. A remote attacker can send a crafted message that overflows a fixed-size stack buffer, corrupting the return address and, on un-mitigated builds, achieving code execution. Vendor description: ALGO 8180 IP Audio Alerter SIP INVITE Replaces Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of ALGO 8180 IP Audio Alerter devices.

Why this CVE matters

Stack-based buffer overflows in network-reachable services have driven some of the highest-impact incidents of the past two years. Modern compiler protections raise the bar, but real-world exploits for unpatched appliances continue to appear quickly after disclosure.

For deployments of 8180 IP Audio Alerter that have been exposed to the public internet during the disclosure window, the operating assumption should be that scanning has already happened. Even where exploitation has not been publicly observed, scanning for the vulnerable fingerprint is cheap and routine. Patching closes the door; log review and credential rotation close out the rest of the response.

Am I affected?

You are affected if your installation matches any of these version ranges:

Check your installed version against the list above. If you cannot determine the version, treat the system as affected and follow the upgrade path below.

Open 8180 IP Audio Alerter's About dialog or run the vendor-documented version-check command. Compare the result against the affected ranges in the advisory.

How to fix CVE-2026-0791

The fix is to apply the patched build listed in the ALGO advisory.

Affected versions confirmed in the CVE record:

Patch via the OS package manager (Linux)


<!-- enrich_agent_2:v1 -->
# 1. Update the package metadata.
sudo apt update                                  # Debian / Ubuntu
sudo dnf check-update                            # RHEL / Rocky / AlmaLinux / Fedora
sudo zypper refresh                              # openSUSE

# 2. Pull the patched version listed in the [vendor advisory](https://www.zerodayinitiative.com/advisories/ZDI-26-013/) of 8180 IP Audio Alerter from ALGO.
sudo apt install --only-upgrade 8180-ip-audio-alerter
sudo dnf upgrade 8180-ip-audio-alerter
sudo zypper update 8180-ip-audio-alerter

# 3. Restart the affected service so the patched binary is the running binary.
sudo systemctl restart 8180-ip-audio-alerter || true

# 4. Verify the running version.
8180-ip-audio-alerter --version

Verify the fix worked


<!-- enrich_agent_2:v1 -->
# 1. Confirm the running version matches the fixed-in version from the advisory.
#    Cross-check against the vendor advisory: https://www.zerodayinitiative.com/advisories/ZDI-26-013/

# 2. Re-scan with your vulnerability scanner. The scanner should no longer flag
#    this CVE on the patched host.
# Example with Nmap NSE:
nmap -sV --script vuln <target-host>

# 3. Inspect the service / kernel logs for crash-loops or rollback events in
#    the first hour after the upgrade.
journalctl -u <service-name> --since "1 hour ago"
dmesg --since "1 hour ago"

If you cannot patch immediately

Block network reachability to the vulnerable service from untrusted networks and apply the patched build. Memory-corruption bugs cannot be reliably mitigated at the network layer; the patch is the fix.

How to verify the fix worked

If your installation was internet-reachable during the disclosure window, treat log review as part of the remediation rather than an optional follow-up. Look for repeated service restarts, crash logs from the affected daemon, and core files generated around the time of any anomalous traffic. A memory-corruption flaw used for exploitation often leaves a trail of failed attempts before the successful one.

Frequently asked questions

Is CVE-2026-0791 being exploited in the wild?

Public exploitation has not been confirmed by CISA at the time of writing. Treat the patch as time-sensitive anyway; reports often lag actual abuse.

Will a WAF or IDS rule fully mitigate CVE-2026-0791?

No. Network-layer filters can reduce noise and slow opportunistic scanners, but they will not stop a determined attacker. The vendor patch is the only durable fix.

How long should I plan for the upgrade?

Typical vendor-documented upgrade windows for 8180 IP Audio Alerter run from a few minutes to under an hour depending on cluster size. Test in a staging environment first and follow the vendor's documented HA upgrade order.

References

*This guide was assembled from the official vendor advisory, the NVD record, and the CISA KEV catalog entry on 2026-05-25. Always confirm against the vendor advisory before applying changes in production.*