CVE-2020-1651 | Junos OS: MX Series: PFE on the line card may crash due to memory leak.

On Juniper Networks MX series, receipt of a stream of specific Layer 2 frames may cause a memory leak resulting in the packet forwarding engine (PFE) on the line card to crash and restart, causing traffic interruption. By continuously sending this stream of specific layer 2 frame, an attacker connected to the same broadcast domain can repeatedly crash the PFE, causing a prolonged Denial of Service (DoS). This issue affects Juniper Networks Junos OS on MX Series: 17.2 versions prior to 17.2R3-S4; 17.2X75 versions prior to 17.2X75-D105.19; 17.3 versions prior to 17.3R3-S7; 17.4 versions prior to 17.4R1-S3, 17.4R2; 18.1 versions prior to 18.1R2. This issue does not affect Juniper Networks Junos OS releases prior to 17.2R1.

Published: 2020-07-17 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-1651 is rated Low Risk (31.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-1651

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2023-03-07 0.89% 0.05% -0.83%
2 2022-04-01 1.40% 0.89% -0.52%
3 2022-02-04 — 1.40% —

Full EPSS history (5 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-1651

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
6.5 3.1 MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:A)
Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
3.3 2.0 LOW
AV:A/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:A)
Requires access to an adjacent network segment.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.5 2.9 [email protected]

Weakness enumeration for CVE-2020-1651

Affected software / configurations for CVE-2020-1651

Vendor Product Version Raw CPE
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:-:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s1:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s2:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s3:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s4:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s5:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s7:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r1-s8:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r2:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r2-s11:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r2-s6:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r2-s7:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r3-s1:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r3-s2:*:*:*:*:*:*
juniper junos 17.2 cpe:2.3:o:juniper:junos:17.2:r3-s3:*:*:*:*:*:*
juniper junos 17.2x75 cpe:2.3:o:juniper:junos:17.2x75:-:*:*:*:*:*:*
juniper junos 17.2x75 cpe:2.3:o:juniper:junos:17.2x75:d102:*:*:*:*:*:*
juniper junos 17.2x75 cpe:2.3:o:juniper:junos:17.2x75:d50:*:*:*:*:*:*
juniper junos 17.2x75 cpe:2.3:o:juniper:junos:17.2x75:d70:*:*:*:*:*:*
juniper junos 17.2x75 cpe:2.3:o:juniper:junos:17.2x75:d92:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:-:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r1-s1:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r2:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r2-s1:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r2-s2:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r2-s3:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r2-s4:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r3:-:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r3-s1:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r3-s2:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r3-s3:*:*:*:*:*:*
juniper junos 17.3 cpe:2.3:o:juniper:junos:17.3:r3-s4:*:*:*:*:*:*
juniper junos 17.4 cpe:2.3:o:juniper:junos:17.4:-:*:*:*:*:*:*
juniper junos 17.4 cpe:2.3:o:juniper:junos:17.4:r1:*:*:*:*:*:*
juniper junos 17.4 cpe:2.3:o:juniper:junos:17.4:r1-s1:*:*:*:*:*:*
juniper junos 17.4 cpe:2.3:o:juniper:junos:17.4:r1-s2:*:*:*:*:*:*
juniper junos 18.1 cpe:2.3:o:juniper:junos:18.1:-:*:*:*:*:*:*
juniper junos 18.1 cpe:2.3:o:juniper:junos:18.1:r1:*:*:*:*:*:*

References for CVE-2020-1651

URL Tags
https://kb.juniper.net/JSA11038 Vendor Advisory
cvelogic Threat Intelligence