Security readout for executives and security teams
Plain-English summary
A person who already has local shell access to an affected Juniper Junos OS Evolved system could read configuration traces that expose hashed login passwords. This does not give remote access by itself, but it can materially increase risk if local accounts are compromised or too broadly granted.
Executive priority
Treat as a controlled but real credential-protection issue. Prioritize remediation for shared, high-value, or internet-edge network devices where local shell access is not tightly restricted.
Technical view
CVE-2020-1621 affects Junos OS Evolved before 19.3R1. Configd traces can expose hashed login password values and are described as world readable. CVSS 3.1 is 5.5 with local attack vector, low complexity, low privileges, no user interaction, and high confidentiality impact only.
Likely exposure
Exposure is limited to Junos OS Evolved deployments running versions prior to 19.3R1 where local authenticated users have shell access.
Exploitation context
The provided sources do not show CISA KEV listing or confirmed active exploitation. Abuse requires local authenticated shell access, so risk is highest on shared administration hosts or environments with weak account governance.
Researcher notes
The issue is confidentiality-only in the CVSS vector and concerns hashed password exposure, not direct plaintext disclosure. Sources do not provide exploit status, detailed patch mechanics, or broader affected product claims beyond Junos OS Evolved before 19.3R1.
Mitigation direction
- Upgrade Junos OS Evolved systems to 19.3R1 or later per vendor guidance.
- Review Juniper JSA11003 for any environment-specific remediation notes.
- Limit shell access to trusted administrators only.
- Review local user accounts and remove unnecessary access.
- Consider password rotation after remediation if hashes may have been exposed.
Validation and detection
- Inventory Junos OS Evolved devices and record running versions.
- Confirm affected systems are not running versions before 19.3R1.
- Review who has local shell access on impacted devices.
- Check whether configd traces are accessible to unintended local users.
- Look for evidence of unusual local account activity.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2020-1621 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.juniper.net/JSA11003CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Control of a Resource Through its Lifetime
Improper Control of a Resource Through its Lifetime represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.