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CVE-2021-0275

28
FAUCET Score

CVE-2021-0275 is a Cross-site Scripting (XSS) vulnerability in J-Web on Juniper Networks Junos OS, affecting numerous versions across EX and SRX Series devices. An attacker can exploit this to hijack an active user session, gaining the same privileges as the targeted user, potentially leading to full device control if the user has root access. With a CVSS score of 8.8 (High), this vulnerability is remotely exploitable with low attack complexity, requiring user interaction. There is currently no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 12.3, < 12.3R12-S15CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 15.1, < 15.1R7-S6CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 12.3X48, < 12.3X48-D95CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 15.1X49, < 15.1X49-D200CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 16.1, < 16.1R7-S7CPE 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
1.17%
Probability of exploitation in next 30 days
EPSS Percentile
64.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0117 is in the 63rd percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Vendor Patches (1)

junipervendor investigatingvia nvd_reference
View patch

References

kb.juniper.net / JSA11166
Vendor Advisory