Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services service activation portal is vulnerable to a Denial of Service (DoS) via malformed HTTP packets (Juniper Networks Junos OS)

CVE-2021-0251

HIGH 8.6

At a glance

Source: NVD
EPSS: EPSS 1.06 % · percentile 65 (2026-11-01)
State: PUBLISHED
Published: 2021-04-22 19:37 UTC
Updated: 2024-09-16 18:56 UTC
Assigner: juniper
NVD status: Modified

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Description

A NULL Pointer Dereference vulnerability in the Captive Portal Content Delivery (CPCD) services daemon (cpcd) of Juniper Networks Junos OS on MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC allows an attacker to send malformed HTTP packets to the device thereby causing a Denial of Service (DoS), crashing the Multiservices PIC Management Daemon (mspmand) process thereby denying users the ability to login, while concurrently impacting other mspmand services and traffic through the device. Continued receipt and processing of these malformed packets will create a sustained Denial of Service (DoS) condition. While the Services PIC is restarting, all PIC services will be bypassed until the Services PIC completes its boot process. An attacker sending these malformed HTTP packets to the device who is not part of the Captive Portal experience is not able to exploit this issue. This issue is not applicable to MX RE-based CPCD platforms. This issue affects: Juniper Networks Junos OS on MX Series 17.3 version 17.3R1 and later versions prior to 17.4 versions 17.4R2-S9, 17.4R3-S2; 18.1 versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R3-S3; 18.3 versions prior to 18.3R3-S1; 18.4 versions prior to 18.4R3; 19.1 versions prior to 19.1R2-S2, 19.1R3; 19.2 versions prior to 19.2R2; 19.3 versions prior to 19.3R3. This issue does not affect: Juniper Networks Junos OS versions prior to 17.3R1.

Weaknesses (CWE)

CWE-476 — NULL Pointer Dereference

References

https://kb.juniper.net/JSA11144

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	juniper
CVSS 3.1	HIGH 8.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	NVD · sirt@juniper.net (Secondary)
CVSS 2.0	MEDIUM 5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2021-2870
GCVE · GCVE-0-2021-0251

CERT-FR advisories

CERTFR-2021-AVI-290 — Multiples vulnérabilités dans les produits Juniper · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:juniper:junos:17.3:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r1-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r2-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r2-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r2-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3:-:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s10:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s8:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.3:r3-s9:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r1-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s6:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r2-s8:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*
+89 more

Affected products

Product	Versions
Juniper Networks · Junos OS	unaffected unspecified < 17.3R1 ; affected 17.3R1 < 17.3* ; affected 17.4 < 17.4R2-S9, 17.4R3-S2 ; affected 18.1 < 18.1R3-S9 ; affected 18.2 < 18.2R3-S3 ; affected 18.3 < 18.3R3-S1

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD

⚠️ Junos OS: MX Series with MS-PIC, MS-SPC3, MS-MIC or MS-MPC: The BRAS Subscriber Services service activation portal is vulnerable to a Denial of Service (DoS) via malformed HTTP packets (Juniper Networks Junos OS)