Cyber Resilience

CVE-2025-21120

Dell Avamar 19.10 … 19.9

Published
04 August 2025
Modified
17 June 2026
Patch / advisory
View advisory
CVSS Score v3.1 8.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
EPSS Score 0.0028 20th percentile
Risk Priority 60 floored blend · peak EPSS

Summary

CVE-2025-21120 is a high-severity Trusting HTTP Permission Methods on the Server Side (CWE-650) vulnerability in Dell Avamar. Its CVSS base score is 8.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 20th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Dell Avamar, versions prior to 19.10 SP1 with patch 338904, contains a Trusting HTTP Permission Methods on the Server-Side vulnerability in Security. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Information exposure.

CWE(s)
CWE-650

Related Threats

MITRE ATT&CK Enterprise Techniques

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2023-44284Same vendor: Dell
CVE-2024-22455Same vendor: Dell
CVE-2024-47484Same vendor: Dell
CVE-2024-24908Same vendor: Dell
CVE-2024-29168Same vendor: Dell
CVE-2025-36588Same vendor: Dell
CVE-2026-41124Same vendor: Dell
CVE-2025-22399Same vendor: Dell
CVE-2024-45764Same vendor: Dell
CVE-2023-44306Same vendor: Dell

Affected Assets

dell
avamar
19.10, 19.12, 19.4, 19.7, 19.8

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V3.5.1
  • V3.5.3
  • V4.1.4

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

AC-3 enforces authorizations for resource access without permitting unsafe assumptions about request methods to bypass checks.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent flawed assumptions about HTTP method safety during design and coding.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover this server-side logic flaw through testing or scanning.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect and prevent vulnerabilities where GET requests cause unintended state changes.

A.8.26 Application security requirements partial match
prevents

Application security requirements can mandate proper HTTP method usage and state-changing operation restrictions.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture principles include proper HTTP method handling and RESTful design to prevent state changes via GET.

A.8.28 Secure coding partial match
prevents

Secure coding practices directly address improper HTTP method usage and ensure state-changing operations use POST/PUT/DELETE.

References