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CVE-2024-21620

22
FAUCET Score

CVE-2024-21620 is a Cross-site Scripting (XSS) vulnerability in the J-Web interface of Juniper Networks Junos OS, impacting SRX Series and EX Series devices. An unauthenticated attacker can craft a malicious URL that, when visited by another user, allows for the execution of commands with the victim's permissions, including administrative access. This vulnerability has a CVSS score of 6.1 (Medium) due to its network attack vector and low attack complexity, potentially leading to limited confidentiality and integrity impacts. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 20.4R3-S10CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 21.2, < 21.2R3-S8CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 21.4, < 21.4R3-S6CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 22.1, < 22.1R3-S5CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 22.2, < 22.2R3-S3CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.91%
Probability of exploitation in next 30 days
EPSS Percentile
56.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0091 is in the 68th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

supportportal.juniper.net / JSA76390
Vendor Advisory