NVD Vulnerability Detail
Search Exploit, PoC
CVE-2021-0217
Summary

A vulnerability in processing of certain DHCP packets from adjacent clients on EX Series and QFX Series switches running Juniper Networks Junos OS with DHCP local/relay server configured may lead to exhaustion of DMA memory causing a Denial of Service (DoS). Over time, exploitation of this vulnerability may cause traffic to stop being forwarded, or to crashing of the fxpc process. When Packet DMA heap utilization reaches 99%, the system will become unstable. Packet DMA heap utilization can be monitored through the following command: user@junos# request pfe execute target fpc0 timeout 30 command "show heap" ID Base Total(b) Free(b) Used(b) % Name -- ---------- ----------- ----------- ----------- --- ----------- 0 213301a8 536870488 387228840 149641648 27 Kernel 1 91800000 8388608 3735120 4653488 55 DMA 2 92000000 75497472 74452192 1045280 1 PKT DMA DESC 3 d330000 335544320 257091400 78452920 23 Bcm_sdk 4 96800000 184549376 2408 184546968 99 Packet DMA <--- 5 903fffe0 20971504 20971504 0 0 Blob An indication of the issue occurring may be observed through the following log messages: Dec 10 08:07:00.124 2020 hostname fpc0 brcm_pkt_buf_alloc:523 (buf alloc) failed allocating packet buffer Dec 10 08:07:00.126 2020 hostname fpc0 (buf alloc) failed allocating packet buffer Dec 10 08:07:00.128 2020 hostname fpc0 brcm_pkt_buf_alloc:523 (buf alloc) failed allocating packet buffer Dec 10 08:07:00.130 2020 hostnameC fpc0 (buf alloc) failed allocating packet buffer This issue affects Juniper Networks Junos OS on EX Series and QFX Series: 17.4R3 versions prior to 17.4R3-S3; 18.1R3 versions between 18.1R3-S6 and 18.1R3-S11; 18.2R3 versions prior to 18.2R3-S6; 18.3R3 versions prior to 18.3R3-S4; 18.4R2 versions prior to 18.4R2-S5; 18.4R3 versions prior to 18.4R3-S6; 19.1 versions between 19.1R2 and 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3 versions prior to 19.3R2-S5, 19.3R3; 19.4 versions prior to 19.4R2-S2, 19.4R3; 20.1 versions prior to 20.1R2; 20.2 versions prior to 20.2R1-S2, 20.2R2. Junos OS versions prior to 17.4R3 are unaffected by this vulnerability.

Publication Date Jan. 16, 2021, 3:15 a.m.
Registration Date Jan. 26, 2021, 10:40 a.m.
Last Update Nov. 21, 2024, 2:42 p.m.
CVSS3.1 : HIGH
スコア 7.4
Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
攻撃元区分(AV) 隣接
攻撃条件の複雑さ(AC)
攻撃に必要な特権レベル(PR) 不要
利用者の関与(UI) 不要
影響の想定範囲(S) 変更あり
機密性への影響(C) なし
完全性への影響(I) なし
可用性への影響(A)
CVSS2.0 : LOW
Score 3.3
Vector AV:A/AC:L/Au:N/C:N/I:N/A:P
攻撃元区分(AV) 隣接
攻撃条件の複雑さ(AC)
攻撃前の認証要否(Au) 不要
機密性への影響(C) なし
完全性への影響(I) なし
可用性への影響(A)
Get all privileges. いいえ
Get user privileges いいえ
Get other privileges いいえ
User operation required いいえ
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:o:juniper:junos:17.4:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:17.4:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.1:r3-s10:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.1:r3-s9:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.1:r3-s7:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.1:r3-s8:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.2:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.2:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.2:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.2:r3-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.2:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.2:r3-s5:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.3:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.3:r3-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.3:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.3:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:18.4:r2-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.1:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.1:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.1:r3-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.1:r3-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r1-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.2:r1-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:-:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r2-s4:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r2-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.3:r2-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.4:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.4:r2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.4:r2-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.4:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:19.4:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.1:r1-s1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.1:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.1:r1-s2:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.1:r1-s3:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.2:r1:*:*:*:*:*:*
cpe:2.3:o:juniper:junos:20.2:r1-s1:*:*:*:*:*:*
execution environment
1 cpe:2.3:h:juniper:ex2300:-:*:*:*:*:*:*:*
2 cpe:2.3:h:juniper:ex2300-c:-:*:*:*:*:*:*:*
3 cpe:2.3:h:juniper:ex2300m:-:*:*:*:*:*:*:*
4 cpe:2.3:h:juniper:ex3400:-:*:*:*:*:*:*:*
5 cpe:2.3:h:juniper:ex4300:-:*:*:*:*:*:*:*
6 cpe:2.3:h:juniper:ex4300m:-:*:*:*:*:*:*:*
7 cpe:2.3:h:juniper:ex4600:-:*:*:*:*:*:*:*
8 cpe:2.3:h:juniper:ex4650:-:*:*:*:*:*:*:*
9 cpe:2.3:h:juniper:ex9200:-:*:*:*:*:*:*:*
10 cpe:2.3:h:juniper:ex9250:-:*:*:*:*:*:*:*
11 cpe:2.3:h:juniper:qfx10002:-:*:*:*:*:*:*:*
12 cpe:2.3:h:juniper:qfx10008:-:*:*:*:*:*:*:*
13 cpe:2.3:h:juniper:qfx10016:-:*:*:*:*:*:*:*
14 cpe:2.3:h:juniper:qfx5100:-:*:*:*:*:*:*:*
15 cpe:2.3:h:juniper:qfx5110:-:*:*:*:*:*:*:*
16 cpe:2.3:h:juniper:qfx5120:-:*:*:*:*:*:*:*
17 cpe:2.3:h:juniper:qfx5130:-:*:*:*:*:*:*:*
18 cpe:2.3:h:juniper:qfx5200:-:*:*:*:*:*:*:*
19 cpe:2.3:h:juniper:qfx5210:-:*:*:*:*:*:*:*
20 cpe:2.3:h:juniper:qfx5220:-:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List

JVN Vulnerability Information
Juniper Networks Junos OS におけるバッファエラーの脆弱性
Title Juniper Networks Junos OS におけるバッファエラーの脆弱性
Summary

Juniper Networks Junos OS には、バッファエラーの脆弱性が存在します。

Possible impacts サービス運用妨害 (DoS) 状態にされる可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。

Publication Date Jan. 13, 2021, midnight
Registration Date Sept. 16, 2021, 6:11 p.m.
Last Update Sept. 16, 2021, 6:11 p.m.
Affected System
ジュニパーネットワークス
Junos OS 
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
Change Log
No Changed Details Date of change
1 [2021年09月16日]
  掲載
Sept. 16, 2021, 6:11 p.m.