Security readout for executives and security teams
Plain-English summary
CVE-2021-0260 is a Junos OS SNMP authorization flaw. If SNMP is reachable, an unauthenticated attacker could read device data or change writable SNMP objects without valid authentication. This affects multiple Junos OS 17.2 through 19.3 release trains.
Executive priority
Prioritize remediation for internet-facing or broadly reachable management interfaces first. This is a high-risk infrastructure issue because unauthenticated SNMP access can expose system data and potentially alter writable management objects.
Technical view
The Junos OS snmpd service fails to properly authorize incoming SNMP requests. The CVSS 3.1 score is 7.3, with network attack vector, low complexity, no privileges, and no user interaction. Impact is limited confidentiality, integrity, and availability exposure through SNMP read actions and writable OIDs.
Likely exposure
Exposure is most likely on Juniper devices running affected Junos OS releases with SNMP enabled and reachable from untrusted or broad internal networks. Versions before 17.2R1 are stated as unaffected.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The issue is still significant because it is remotely reachable, unauthenticated, and targets network infrastructure management services.
Researcher notes
Evidence supports improper authorization in Junos OS snmpd across listed 17.2 to 19.3 trains. The bundle does not provide exploit details, observed attacks, or compensating controls beyond version scope and vendor reference.
Mitigation direction
- Upgrade affected Junos OS trains to fixed releases identified by Juniper guidance.
- Restrict SNMP access to trusted management networks only.
- Disable SNMP where it is not operationally required.
- Review SNMP configuration for writable OIDs and unnecessary write capability.
- Monitor vendor advisory JSA11151 for product-specific remediation details.
Validation and detection
- Inventory Juniper devices and map Junos OS versions against the affected release list.
- Confirm whether SNMP is enabled and reachable beyond trusted management paths.
- Verify upgraded devices run a fixed or unaffected Junos OS release.
- Review logs and monitoring for unusual SNMP access patterns.
- Confirm SNMP write access is disabled or tightly controlled where possible.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-285: Exact CWE lookup
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Open ATT&CK lookupCWE-497: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-0260 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
- High
- CVSS
- 7.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
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:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L3.93.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.3HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.juniper.net/JSA11151CVE reference · x_refsource_MISC
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 Authorization
Improper Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Exposure of Sensitive System Information to an Unauthorized Control Sphere
Exposure of Sensitive System Information to an Unauthorized Control Sphere represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.