Security readout for executives and security teams
Plain-English summary
CVE-2020-1625 is a Junos OS denial-of-service issue. On affected devices using IRB with multiple underlay physical interfaces, an interface flap can cause kernel temporary memory usage to keep growing. Over time, that can disrupt running processes and create an extended outage.
Executive priority
Treat as a planned but important network availability fix. It is not documented as actively exploited here, but affected routing infrastructure can suffer prolonged service disruption if the configuration and interface-flap condition are present.
Technical view
The issue is a kernel memory leak shown as rising temp virtual-memory requests. It is tied to the documented IRB plus multiple-underlay interface-flap condition and maps to CWE-400 resource consumption. CVSS is 6.5, adjacent-network, low complexity, no privileges, no user interaction, with high availability impact.
Likely exposure
Exposure is limited to affected Junos OS 16.1 through 19.2 release trains listed by Juniper, when IRB is configured with multiple underlay physical interfaces. Junos OS 12.3 and 15.1 are stated as unaffected.
Exploitation context
The source bundle does not show CISA KEV listing or public active exploitation evidence. The condition depends on interface flapping in a specific network configuration, but no exploit procedure is needed to understand the availability risk.
Researcher notes
Evidence is strongest for affected versions, trigger conditions, monitoring signal, and availability impact. The bundle does not provide exploit status, workaround detail, or product scope beyond Juniper Networks Junos OS.
Mitigation direction
- Upgrade affected Junos OS devices to the fixed releases listed by Juniper.
- Prioritize devices running IRB with multiple underlay physical interfaces.
- Check Juniper JSA11004 for platform-specific fixed-release and support guidance.
- Monitor vulnerable devices closely until maintenance is complete.
- Avoid unnecessary interface instability where operationally feasible.
Validation and detection
- Inventory Junos OS versions against Juniper's affected release list.
- Identify devices using IRB with multiple underlay physical interfaces.
- Monitor temp virtual-memory requests for sustained growth.
- Correlate memory growth with interface flap events.
- Review daemon instability or extended outage symptoms on exposed devices.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-1625 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://kb.juniper.net/JSA11004CVE 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.