CVE-2021-31589Appliance Base Software XSS
A cross-site scripting (XSS) vulnerability has been reported and confirmed for BeyondTrust Secure Remote Access Base Software version 6.0.1 and older, which allows the injection of unauthenticated, specially-crafted web requests without proper sanitization.
Published Jan 5, 2022 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2021-31589 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Appliance Base Software (Beyondtrust).
- It is exploited in the wild, listed in Industry KEV feed since Aug 19, 2022. No public exploit code is known.
- EPSS estimates a 26% probability of exploitation in the next 30 days.
- Fixed versions are available, including Appliance Base Software <=6.0.1, Appliance Base Software 6.0.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
26%
Higher than 97.9% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
46/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Aug 19, 2022
226 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
6
Reports of active use
Advisories And Exploit References
Description
A cross-site scripting (XSS) vulnerability has been reported and confirmed for BeyondTrust Secure Remote Access Base Software version 6.0.1 and older, which allows the injection of unauthenticated, specially-crafted web requests without proper sanitization.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Aug 19, 2022 | n/a | Not reported |
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Appliance Base SoftwareBeyondtrust | See advisory | 6.0.1 |
Patched Releases
Appliance Base Software
<=6.0.1
Timeline
Publicly disclosed
Jan 5, 2022
Added to Industry KEV feed
Aug 19, 2022
Last updated
Nov 21, 2024
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisorybeyondtrust.com · release-notes
- exploitVulnCheck exploitation report
- exploitpacketstormsecurity.com · BeyondTrust-Remote-Support-6.0-Cross-Site-Scrip…
- exploitcxsecurity.com · WLB-2022010013
- exploitVulnCheck exploitation report
FAQ
Common Questions.
A cross-site scripting (XSS) vulnerability has been reported and confirmed for BeyondTrust Secure Remote Access Base Software version 6.0.1 and older, which allows the injection of unauthenticated, specially-crafted web requests without proper sanitization.
Affected: Appliance Base Software (Beyondtrust). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Aug 19, 2022.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Appliance Base Software <=6.0.1, Appliance Base Software 6.0.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2021-31589 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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