Security Resilience

CVE-2024-21615

Juniper Junos Os Evolved ≤ 21.2

Published
12 April 2024
Modified
06 February 2025
Patch / advisory
View advisory
CVSS Score v4 5.1
Click a component to see what it means
Raw vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0015 4th percentile
Risk Priority 35 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2024-21615 is a medium-severity Incorrect Default Permissions (CWE-276) vulnerability in Juniper Junos Os Evolved. Its CVSS base score is 5.1 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Services File Permissions Weakness (T1574.010); ranked at the 4th 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) and AC-6 (Least Privilege) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A01:2025 Broken Access Control

EU & UK References

Vulnerability Data

An Incorrect Default Permissions vulnerability in Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privileged attacker to access confidential information on the system. On all Junos OS and Junos OS Evolved platforms, when NETCONF traceoptions are configured,…

more

and a super-user performs specific actions via NETCONF, then a low-privileged user can access sensitive information compromising the confidentiality of the system. This issue affects: Junos OS: * all versions before 21.2R3-S7, * from 21.4 before 21.4R3-S5, * from 22.1 before 22.1R3-S5, * from 22.2 before 22.2R3-S3, * from 22.3 before 22.3R3-S2, * from 22.4 before 22.4R3, * from 23.2 before 23.2R1-S2. Junos OS Evolved: * all versions before 21.2R3-S7-EVO, * from 21.3 before 21.3R3-S5-EVO, * from 21.4 before 21.4R3-S5-EVO, * from 22.1 before 22.1R3-S5-EVO, * from 22.2 before 22.2R3-S3-EVO, * from 22.3 before 22.3R3-S2-EVO, * from 22.4 before 22.4R3-EVO, * from 23.2 before 23.2R1-S2.

CWE(s)
CWE-276

Related Threats

MITRE ATT&CK Enterprise Techniques

T1574.010 Services File Permissions Weakness Stealth
Adversaries may execute their own malicious payloads by hijacking the binaries used by services.
attack.mitre.org →
T1003.001 LSASS Memory Credential Access
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
attack.mitre.org →
T1003.006 DCSync Credential Access
Adversaries may attempt to access credentials and other sensitive information by abusing a Windows Domain Controller's application programming interface (API)(Citation: Microsoft DRSR Dec 2017) (Citation: Microsoft GetNCCChanges) (Citati…
attack.mitre.org →
T1010 Application Window Discovery Discovery
Adversaries may attempt to get a listing of open application windows.
attack.mitre.org →
T1011.001 Exfiltration Over Bluetooth Exfiltration
Adversaries may attempt to exfiltrate data over Bluetooth rather than the command and control channel.
attack.mitre.org →
T1021.002 SMB/Windows Admin Shares Lateral Movement
Adversaries may use [Valid Accounts](https://attack.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-39544Same product: Juniper Junos Os Evolved
CVE-2023-44194Same product: Juniper Junos
CVE-2023-28966Same product: Juniper Junos Os Evolved
CVE-2024-21596Same product: Juniper Junos
CVE-2025-52955Same product: Juniper Junos
CVE-2025-60003Same product: Juniper Junos
CVE-2024-39532Same product: Juniper Junos
CVE-2023-44176Same product: Juniper Junos
CVE-2024-30394Same product: Juniper Junos
CVE-2023-44178Same product: Juniper Junos

Affected Assets

juniper
junos
21.2, 21.4, 22.1, 22.2, 22.3 · ≤ 21.2
juniper
junos os evolved
21.2, 21.3, 21.4, 22.1, 22.2 · ≤ 21.2

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 7 hardening rules · 2 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

Enforces approved authorizations on files and resources so overly permissive defaults cannot be exploited.

AC-6 Least Privilege good match

Requires least-privilege defaults so that installed files are not world-writable by default.

CM-6 Configuration Settings good match

Requires documented, restrictive configuration settings that cover file and directory permissions.

CM-5 Access Restrictions for Change partial match

Enforces access restrictions on changes, including permission settings applied during installation or configuration.

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.

ID.AM-08 partial match
blocks

Lifecycle management can encompass permission settings, yet the control is too broad to specifically mitigate incorrect defaults.

PR.AA-05 partial match
blocks

Defining and enforcing least-privilege access permissions directly prevents overly permissive defaults at install time.

PR.PS-01 partial match
blocks

Hardened baselines and configuration management explicitly require correct default file permissions.

PR.PS-06 partial match
blocks

Secure SDLC practices include establishing secure defaults, but address only the development-phase portion of the weakness.

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.5.14 Information transfer partial match
removes
A.5.15 Access control partial match
removes
A.5.16 Identity management partial match
removes
A.5.17 Authentication information partial match
removes
A.5.18 Access rights partial match
removes
A.8.10 Information deletion partial match
removes

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (higher-evidence rows only; rows rated `none` are excluded).

Windows Server 2016 (2 rules)
  • V-224833 Permissions for program file directories must conform to minimum requirements. blocks CWE-276
  • V-224834 Permissions for the Windows installation directory must conform to minimum requirements. blocks CWE-276
Windows Server 2019 (2 rules)
  • V-205735 Windows Server 2019 permissions for program file directories must conform to minimum requirements. blocks CWE-276
  • V-205736 Windows Server 2019 permissions for the Windows installation directory must conform to minimum requirements. blocks CWE-276

References