Fireware OS SIP 代理緩衝區溢位漏洞 可遠端執行任意程式
CVE-2026-93857 - Fireware OS Pre-Authentication Stack Buffer Overflow in SIP Proxy Allows Remote Code Execution
Fireware OS 的 SIP 代理存在堆疊緩衝區溢位漏洞，允許未授權遠端攻擊者透過特殊請求執行任意程式。
- 漏洞影響：任何使用 SIP 代理的 WatchGuard Fireware OS 版本均受影響，遠端未授權者可利用。
此漏洞可讓未授權遠端攻擊者透過 SIP 代理執行任意程式，提醒使用者即時套用補丁並限制代理存取，避免遠端執行危害。
A stack-based buffer overflow vulnerability in Fireware OS's SIP proxy allows a remote, unauthenticated attacker to execute arbitrary code by sending a specially crafted request through a policy that uses the SIP proxy.
Impact
Affected Products
The following products are affected by CVE-2026-93857
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
| ID | Vendor | Product | Action |
|---|---|---|---|
| 1 | Watchguard | fireware_os |
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | CRITICAL | 5d1c2695-1a31-4499-88ae-e847036fd7e3 |
Patch Fireware OS to fix the SIP proxy buffer overflow vulnerability.
- Apply the vendor-supplied patch for Fireware OS.
- Restrict access to the SIP proxy.
- Monitor SIP traffic for anomalies.
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-93857.
| URL | Resource |
|---|---|
| https://psirt.watchguard.com/CVE-2026-93857 |
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-93857 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-93857
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-93857 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-93857 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 5d1c2695-1a31-4499-88ae-e847036fd7e3
十月. 27, 2026
Action Type Old Value New Value Added Description A stack-based buffer overflow vulnerability in Fireware OS's SIP proxy allows a remote, unauthenticated attacker to execute arbitrary code by sending a specially crafted request through a policy that uses the SIP proxy. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-787 Added CWE CWE-120 Added CWE CWE-121 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/93xxx/CVE-2026-93857.json">CVE-2026-93857</a> Added Reference https://psirt.watchguard.com/CVE-2026-93857
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.