CVE-2021-31386
Junos OS: When using J-Web with HTTP an attacker may retrieve encryption keys via Person-in-the-Middle attacks.
- Published
- Updated
- Reserved
- Assigned by
- juniper
Description
A Protection Mechanism Failure vulnerability in the J-Web HTTP service of Juniper Networks Junos OS allows a remote unauthenticated attacker to perform Person-in-the-Middle (PitM) attacks against the device. This issue affects: Juniper Networks Junos OS 12.3 versions prior to 12.3R12-S20; 15.1 versions prior to 15.1R7-S11; 18.3 versions prior to 18.3R3-S6; 18.4 versions prior to 18.4R3-S10; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R3-S4; 19.3 versions prior to 19.3R3-S4; 19.4 versions prior to 19.4R3-S6; 20.1 versions prior to 20.1R3-S2; 20.2 versions prior to 20.2R3-S3; 20.3 versions prior to 20.3R3-S1; 20.4 versions prior to 20.4R3; 21.1 versions prior to 21.1R3; 21.2 versions prior to 21.2R2.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| juniperCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N |
| NVDNVD · Modified | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.71% · top 46% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
- CWE-311: Missing Encryption of Sensitive Data (opens in a new tab)All about CWE-311 and its CVEs
- CWE-325: Missing Cryptographic Step (opens in a new tab)All about CWE-325 and its CVEs
- CWE-693: Protection Mechanism Failure (opens in a new tab)All about CWE-693 and its CVEs
- CWE-300 Channel Accessible by Non-Endpoint ('Man-in-the-Middle') (opens in a new tab)All about CWE-300 and its CVEs
Affected products
- affected 12.3 – < 12.3R12-S20
- affected 15.1 – < 15.1R7-S11
- affected 18.3 – < 18.3R3-S6
- affected 18.4 – < 18.4R3-S10
- affected 19.1 – < 19.1R3-S7
- affected 19.2 – < 19.2R3-S4
- affected 19.3 – < 19.3R3-S4
- affected 19.4 – < 19.4R3-S6
- affected 20.1 – < 20.1R3-S2
- affected 20.2 – < 20.2R3-S3
- affected 20.3 – < 20.3R3-S1
- affected 20.4 – < 20.4R3
- affected 21.1 – < 21.1R3
- affected 21.2 – < 21.2R2
What to do
Solution: The following software releases have been updated to resolve this specific issue: 12.3R12-S20, 15.1R7-S11, 18.3R3-S6, 18.4R3-S10, 19.1R3-S7, 19.2R3-S4, 19.3R3-S4, 19.4R3-S6, 20.1R3-S2, 20.2R3-S3, 20.3R3-S1, 20.4R3, 21.1R3, 21.2R2, 21.3R1, and all subsequent releases. Note: Use of HTTP must also be discontinued.
Workaround: Discontinue the use of HTTP, instead use HTTPS when using J-Web. [system services web-management https]
Exploitation: Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
References (1)
- https://kb.juniper.net/JSA11254 (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-31386)Record last updated .