CVE-2021-1278

highpriority · track · 31EPSS 0.017 · 77 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.68% (77th) EPSS

CVSS 7.8 · high

Is it mine?

89 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco IOS XE Catalyst SD-WAN 16.10.1 when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.1 when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.1 when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.1 when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.2 when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.2 when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.2 when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.2 when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3 when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3 when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3 when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3 when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3a when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3a when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3a when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3a when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3a when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3b when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3b when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3b when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3b when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.3b when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.4 when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.4 when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.4 when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.4 when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.4 when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.5 when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.5 when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.5 when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.5 when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.10.5 when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.11.1a when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.11.1a when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.11.1a when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.11.1a when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.11.1a when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.11.1f when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1b when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1b when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1b when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1b when installed on Cisco Catalyst IR1100 Rugged Series Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1b when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1b when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1d when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1d when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1d when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1d when installed on Cisco Catalyst IR1100 Rugged Series Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1d when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1d when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1e when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1e when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1e when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1e when installed on Cisco Catalyst IR1100 Rugged Series Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1e when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.1e when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.2r when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.2r when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.2r when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.2r when installed on Cisco Catalyst IR1100 Rugged Series Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.2r when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.2r when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.3 when installed on Cisco 1000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.3 when installed on Cisco 4000 Series Integrated Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.3 when installed on Cisco ASR 1000 Series Aggregation Services Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.3 when installed on Cisco Catalyst IR1100 Rugged Series Routerscisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.3 when installed on Cisco Cloud Services Router 1000V Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Catalyst SD-WAN 16.12.3 when installed on Cisco Integrated Services Virtual Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco IOS XE Softwarecisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco SD-WAN vEdge Cloudcisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco SD-WAN vEdge Routercisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

8.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.5–8.6

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.5mediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · Cisco PSIRT US

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.16.7mediumAV:L/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:Hsecondary · FSTEC (BDU) RU

v3.18.6highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 3.9 · impact 4

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-59USprimaryCWE-119USCWE-119US

affected products (89)

Products and version ranges known to be affected.

showing 20 of 89

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-sdwan-dosmulti-48jJuEUPCisco SD-WAN Denial of Service Vulnerabilities2021-01-20csaf · cisco_csafUS
Multiple vulnerabilities in Cisco SD-WAN products could allow an unauthenticated, remote attacker to execute denial of service (DoS) attacks against an affected device. For more information about these vulnerabilities, see the Details ["#details"] section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf NVD CVE.org MITRE

published 2021-01-20modified 2026-06-17

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+2367 more

references (6)

External citations — patches, advisories, analysis.

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