CVE-2021-0282Network attack vector

Remote DoS via malformed BGP UPDATE

Published Jul 15, 2021 · Updated Sep 16, 2024

Junos OS before the listed fixed releases allows remote attackers to cause routing-process crashes via a specific BGP UPDATE. The RPD daemon crashes and restarts when BGP Multipath or add-path processing handles the crafted update, and repeated receipt sustains the outage. Exploitation requires a reachable IBGP or EBGP peer and the affected feature enabled; devices without Multipath or add-path are not affected.

CVSS severity7.5
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Junos OS before the listed fixed releases allows remote attackers to cause routing-process crashes via a specific BGP UPDATE. The RPD daemon crashes and restarts when BGP Multipath or add-path processing handles the crafted update, and repeated receipt sustains the outage. Exploitation requires a reachable IBGP or EBGP peer and the affected feature enabled; devices without Multipath or add-path are not affected.

The record

CVE
CVE-2021-0282
Published
Jul 15, 2021
Updated
Sep 16, 2024
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-754, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.3 <12.3R12-S18
  2. Affected versionversion=15.1 <15.1R7-S9
  3. Affected versionversion=17.3 <17.3R3-S11
  4. Affected versionversion=17.4 <17.4R2-S13, 17.4R3-S4
  5. Affected versionversion=18.1 <18.1R3-S12
  6. Affected versionversion=18.2 <18.2R3-S7
  7. Affected versionversion=18.3 <18.3R3-S4
  8. Affected versionversion=18.4 <18.4R2-S6, 18.4R3-S6
  9. Affected versionversion=19.1 <19.1R3-S3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=12.3 <12.3R12-S18; version=15.1 <15.1R7-S9; version=17.3 <17.3R3-S11; version=17.4 <17.4R2-S13, 17.4R3-S4; version=18.1 <18.1R3-S12; version=18.2 <18.2R3-S7; version=18.3 <18.3R3-S4; version=18.4 <18.4R2-S6, 18.4R3-S6; version=19.1 <19.1R3-S3

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1498Network Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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