CVE-2021-0231
CVE-2021-0231 is a medium-severity vulnerability in Juniper Junos with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- CVSS v2: 6.8
- EPSS exploit prediction: 1% (65th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Juniper Junos
- Published:
- Last modified:
Description
A path traversal vulnerability in the Juniper Networks SRX and vSRX Series may allow an authenticated J-web user to read sensitive system files. This issue affects Juniper Networks Junos OS on SRX and vSRX Series: 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R1-S3, 20.2R2; This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.
Frequently asked questions
- What is CVE-2021-0231?
- A path traversal vulnerability in the Juniper Networks SRX and vSRX Series may allow an authenticated J-web user to read sensitive system files. This issue affects Juniper Networks Junos OS on SRX and vSRX Series: 19.3 versions prior to 19.3R2-S6, 19.3R3-S1; 19.4 versions prior to 19.4R2-S4, 19.4R3; 20.1 versions prior to 20.1R1-S4, 20.1R2; 20.2 versions prior to 20.2R1-S3, 20.2R2; This issue does not affect Juniper Networks Junos OS versions prior to 19.3R1.
- How severe is CVE-2021-0231?
- CVE-2021-0231 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2021-0231 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-0231?
- CVE-2021-0231 primarily affects Juniper Junos. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2021-0231?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-0231 published?
- CVE-2021-0231 was published on 2021-04-22 and last updated on 2026-06-17.
References
Affected products (24)
- cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2-s4:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r2-s5:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.3:r3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r2-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r2-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:19.4:r2-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.1:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.1:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.1:r1-s2:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.1:r1-s3:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.2:r1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.2:r1-s1:*:*:*:*:*:*
- cpe:2.3:o:juniper:junos:20.2:r1-s2:*:*:*:*:*:*
More vulnerabilities in Juniper Junos
- CVE-2021-0248 — Critical (CVSS 10.0): This issue is not applicable to NFX NextGen Software. On NFX Series devices the use of Hard-coded Credentials in…
- CVE-2021-0211 — Critical (CVSS 10.0): An improper check for unusual or exceptional conditions in Juniper Networks Junos OS and Junos OS Evolved Routing…
- CVE-2020-1614 — Critical (CVSS 10.0): A Use of Hard-coded Credentials vulnerability exists in the NFX250 Series for the vSRX Virtual Network Function (VNF)…
- CVE-2017-2343 — Critical (CVSS 10.0): The Integrated User Firewall (UserFW) feature was introduced in Junos OS version 12.1X47-D10 on the Juniper SRX Series…
- CVE-2013-4685 — Critical (CVSS 10.0): Buffer overflow in flowd in Juniper Junos 10.4 before 10.4S14, 11.4 before 11.4R7, 12.1 before 12.1R6, and 12.1X44…
- CVE-2017-2349 — Critical (CVSS 9.9): A command injection vulnerability in the IDP feature of Juniper Networks Junos OS on SRX series devices potentially…
All CVEs affecting Juniper Junos →
Other CWE-22 (Path Traversal) vulnerabilities
- CVE-2026-48282 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Limitation of a Pathname to a Restricted…
- CVE-2026-54917 — Critical (CVSS 10.0): SeaweedFS is a distributed storage system for object storage (S3), file systems, and Iceberg tables. Prior to 4.30, the…
- CVE-2026-11429 — Critical (CVSS 10.0): Two endpoints in the Vault Service ScriptsController, shared by Altium Enterprise Server and Altium 365, accept file…
- CVE-2026-34909 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit a Path Traversal vulnerability found in UniFi OS devices to…
- CVE-2026-7411 — Critical (CVSS 10.0): In Eclipse BaSyx Java Server SDK versions prior to 2.0.0-milestone-10, inadequate path normalization in the Submodel…
- CVE-2026-36767 — Critical (CVSS 10.0): A path traversal vulnerability in the /content/images/add endpoint of shopizer v3.2.5 allows attackers write arbitrary…