CVE-2026-27754 Overview
CVE-2026-27754 affects SODOLA SL902-SWTGW124AS firmware versions through 200.1.20. The device generates session cookies using the cryptographically broken MD5 hash function. This weak algorithm choice exposes session tokens to collision and predictability attacks. Remote attackers can forge valid session cookies and gain unauthorized access to the managed switch web interface.
The weakness is classified under [CWE-328] (Use of Weak Hash). The vulnerability is exploitable over the network without authentication or user interaction, though confidentiality and integrity impact are limited to the affected device.
Critical Impact
Attackers can forge session cookies and obtain unauthorized administrative access to SL902-SWTGW124AS network switches over the network.
Affected Products
- SODOLA SL902-SWTGW124AS firmware versions through 200.1.20
- SODOLA SL902-SWTGW124AS hardware (6-Port 2.5G Easy Web Managed Switch)
- All deployments exposing the device web management interface to untrusted networks
Discovery Timeline
- 2026-02-27 - CVE-2026-27754 published to NVD
- 2026-03-03 - Last updated in NVD database
Technical Details for CVE-2026-27754
Vulnerability Analysis
The SL902-SWTGW124AS web management interface authenticates user sessions using cookies derived from MD5 hashes. MD5 has been considered cryptographically broken for over two decades due to practical collision attacks and weak preimage resistance. When session tokens depend on MD5 output, an attacker can predict, brute-force, or collide token values.
The vulnerability resides in the session cookie generation routine. Where modern devices rely on HMAC-SHA256 or cryptographically secure random number generators, this firmware uses MD5 over predictable inputs. The combination of weak hashing and predictable seed material produces session tokens an attacker can reconstruct offline.
Successful exploitation grants the attacker the same privileges as the legitimate session owner, including switch configuration access. According to the VulnCheck Security Advisory, the issue is reproducible across firmware builds up to and including 200.1.20.
Root Cause
The root cause is the selection of MD5 as the cryptographic primitive for session identifier generation. MD5 produces 128-bit digests vulnerable to chosen-prefix collisions and offers no resistance to modern token-forgery techniques. Compounding this, the input material fed into MD5 appears to lack sufficient entropy, making tokens predictable rather than random.
Attack Vector
The attack vector is network-based and requires no prior authentication. An attacker reaches the switch web interface, observes or predicts session cookie structure, and computes valid MD5-based tokens. With a forged cookie, the attacker submits authenticated HTTP requests to the management portal. The vulnerability does not require user interaction or local access, but exploitation impact is bounded by the device scope.
The vulnerability is described in prose only because no public proof-of-concept code is currently available. Consult the VulnCheck Security Advisory for additional technical details on the token generation routine.
Detection Methods for CVE-2026-27754
Indicators of Compromise
- Unexpected configuration changes on SL902-SWTGW124AS switches, including VLAN, QoS, or port mirroring modifications
- Authenticated HTTP sessions to the device originating from unfamiliar source IP addresses
- Multiple concurrent administrative sessions for the same account
- Web access logs showing valid session cookies arriving without a preceding successful /login request
Detection Strategies
- Inspect device access logs for session cookies that do not correlate with prior authentication events
- Monitor network telemetry for HTTP requests to the switch management interface from non-administrative subnets
- Alert on configuration export, firmware download, or credential modification actions occurring outside change windows
- Correlate device login activity against approved administrator IP allowlists
Monitoring Recommendations
- Forward switch syslog data to a centralized log platform and apply identification rules for anomalous management traffic
- Enable NetFlow or sFlow on upstream devices to track sessions reaching the switch web interface
- Review authentication audit trails on a recurring schedule for impossible-travel and out-of-hours administrative logins
How to Mitigate CVE-2026-27754
Immediate Actions Required
- Restrict access to the SL902-SWTGW124AS web management interface to a dedicated, isolated management VLAN
- Block all external and untrusted network reachability to the switch HTTP/HTTPS management ports
- Rotate administrative credentials and terminate any active management sessions
- Audit current switch configuration against a known-good baseline for unauthorized changes
Patch Information
No vendor patch is currently referenced in the NVD entry for CVE-2026-27754. Monitor the Sodola Network product page and the VulnCheck advisory for firmware updates that replace MD5-based session tokens with a cryptographically secure primitive.
Workarounds
- Place the switch management interface behind a jump host or VPN that enforces strong authentication
- Apply firewall ACLs restricting TCP access to the web interface to specific administrator workstations
- Disable the web management interface entirely if CLI or out-of-band management is available
- Reduce administrative session lifetime and require re-authentication for sensitive configuration actions
# Example ACL restricting management access to a single admin host
# Apply on the upstream router or firewall protecting the switch
access-list 110 permit tcp host 10.10.0.25 host 192.0.2.10 eq 80
access-list 110 permit tcp host 10.10.0.25 host 192.0.2.10 eq 443
access-list 110 deny tcp any host 192.0.2.10 eq 80
access-list 110 deny tcp any host 192.0.2.10 eq 443
access-list 110 permit ip any any
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
