CVE-2025-34058: Hikvision Media Server Auth Bypass Flaw

CVE-2025-34058 Overview

CVE-2025-34058 affects Hikvision Streaming Media Management Server v2.3.5. The product ships with default credentials that allow remote attackers to authenticate without prior access. Once authenticated, attackers chain an arbitrary file read flaw in the /systemLog/downFile.php endpoint. The endpoint accepts a fileName parameter vulnerable to directory traversal [CWE-22], enabling retrieval of files outside the intended log directory. The combination of hardcoded default credentials and path traversal exposes sensitive system files, configuration data, and credentials stored on the host.

Critical Impact

Remote unauthenticated attackers can leverage default credentials and a directory traversal flaw in downFile.php to read arbitrary files from the Hikvision Streaming Media Management Server.

Affected Products

• Hikvision Streaming Media Management Server v2.3.5
• Deployments exposing the management interface to untrusted networks
• Installations retaining vendor default credentials

Discovery Timeline

• 2025-07-01 - CVE-2025-34058 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-34058

Vulnerability Analysis

The vulnerability is a two-stage exploit chain. The first stage abuses default credentials shipped with Hikvision Streaming Media Management Server v2.3.5. An attacker reaching the management interface over the network authenticates using these documented credentials without any prior compromise.

The second stage targets the /systemLog/downFile.php endpoint. This handler is intended to deliver log files to authenticated administrators. It accepts a fileName request parameter but fails to canonicalize or restrict the supplied path. An attacker submits traversal sequences such as ../../../../etc/passwd or Windows-style paths to escape the log directory.

The server reads the resolved path and returns the file contents in the HTTP response. Attackers can extract operating system files, application configuration, database connection strings, and stored credentials. According to EPSS data, the vulnerability sits in the 86th percentile for exploitation likelihood.

Root Cause

Two distinct weaknesses combine in this issue. The product distribution includes hardcoded default account credentials that customers are not forced to rotate at first login. The downFile.php script then performs no path normalization, allow-list validation, or chroot containment on the fileName parameter before opening the requested file.

Attack Vector

The attack vector is network-based and requires no user interaction. An attacker locates an exposed Hikvision Streaming Media Management Server, authenticates with default credentials, and issues an HTTP request to /systemLog/downFile.php with a traversal payload in the fileName query parameter. The server returns the requested file. Refer to the VulnCheck Advisory on Hikvision for proof-of-concept request structure.

Detection Methods for CVE-2025-34058

Indicators of Compromise

• HTTP requests to /systemLog/downFile.php containing ../ sequences or encoded variants such as %2e%2e%2f in the fileName parameter.
• Successful logins to the management console from external or unexpected source IP addresses using default administrative usernames.
• Web server access logs showing 200 OK responses for downFile.php requests referencing paths outside the application log directory.
• Outbound transfers of large or unusual response bodies from the streaming media server to attacker-controlled hosts.

Detection Strategies

• Inspect web server and application access logs for GET or POST requests to downFile.php with traversal patterns in any parameter.
• Alert on authentication events using vendor default account names against the management interface.
• Correlate authentication events with subsequent file download requests to identify the full exploit chain.

Monitoring Recommendations

• Enable verbose HTTP logging on the Hikvision management interface and forward logs to a centralized SIEM.
• Deploy network detection signatures for directory traversal sequences targeting downFile.php.
• Monitor egress traffic from camera and streaming infrastructure segments for anomalous data volumes.

How to Mitigate CVE-2025-34058

Immediate Actions Required

• Remove or rotate all default credentials on Hikvision Streaming Media Management Server v2.3.5 deployments immediately.
• Restrict network access to the management interface using firewall rules so only trusted administrative networks can reach it.
• Audit web server logs for prior exploitation attempts against /systemLog/downFile.php.
• Rotate any credentials, certificates, or secrets that may have been stored on the affected host.

Patch Information

Consult the Hikvision Cybersecurity Advisory portal for the latest firmware and patch availability for the Streaming Media Management Server product line. Apply vendor-supplied updates as soon as they are released and verify post-update that the default account has been disabled or its password forcibly changed.

Workarounds

• Place the management server behind a VPN or jump host and block direct internet exposure of TCP ports used by the web interface.
• Disable or rename the default administrative account if vendor configuration permits.
• Use a reverse proxy or web application firewall to block requests to downFile.php containing traversal sequences such as ../, ..\, %2e%2e%2f, and %2e%2e%5c.

# Example WAF rule to block directory traversal against the vulnerable endpoint
SecRule REQUEST_URI "@contains /systemLog/downFile.php" \
    "id:1034058,phase:1,deny,status:403,\
     chain,msg:'CVE-2025-34058 traversal attempt'"
  SecRule ARGS:fileName "@rx (\.\./|\.\.\\|%2e%2e(%2f|%5c))" \
    "t:lowercase,t:urlDecodeUni"