VulnSocial

CVE-2026-20084Disclosure(cisco / ios_xe)

LOWCVSS 8.6 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch cisco ios_xe systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets. There are workarounds that address this vulnerability.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-400

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • ios_xe

Threat summary

  • Patch or workaround signal is available
  • 5 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 3 classified signals
  • General: 1 classified signal
  • Peaked 2d ago at 2 mentions (2026-03-25); latest day: 1
  • 5 total mentions across 3 days

Affected systems

Vendors
cisco
Products
ios_xe

107 versions affected across 1 product

Deep dive

Activity timeline5 mentions / 3d
01122Mentions · 2026-03-25: 2Mentions · 2026-03-30: 2Mentions · 2026-03-31: 1Patch / Workaround · 2026-03-25: 1Technical Details · 2026-03-25: 2Technical Details · 2026-03-30: 103-2503-3003-31
Signal classification3 categories
Disclosure
360.0%
Patch
120.0%
General
120.0%
Referenced assets5 URLs
Classification over time
DateTotalLabels
2026-03-252
Disclosure1Patch1
2026-03-302
Disclosure1General1
2026-03-311
Disclosure1
Full discourse5 posts
  • CERT-PY@CERTpy
    Disclosure

    ⚠️ Vulnerabilidades en productos Cisco ❗ CVE-2026-20086 ❗ CVE-2026-20084 ❗ CVE-2026-20012 ➡️ Más info: https://www.cert.gov.py/vulnerabilidades-en-productos-cisco-12/ https://t.co/xmpmaWItA6

    Post summary

    The tweet announces three Cisco CVEs and directs readers to a link for additional information, but it does not provide technical details, exploits, or patch guidance.

    10010265
    6.6K followersView on X
  • CVE@CVEnew
    General

    CVE-2026-20084 A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between V… https://www.cve.org/CVERecord?id=CVE-2026-20084

    Post summary

    The tweet merely announces a new CVE (CVE-2026-20084) without providing evidence of exploitation, technical specifics, or mitigation steps.

    00010191
    56.8K followersView on X
  • CVEFind.com@CveFindCom
    Patch

    [CVE-2026-20084: HIGH] Critical vulnerability in Cisco IOS XE Software allows remote attackers to trigger a denial of service by forwarding BOOTP packets between VLANs. A fix is available.#cve,CVE-2026-20084,#cybersecurity https://cvefind.com/CVE-2026-20084

    Post summary

    This brief announcement highlights a high‑severity denial‑of‑service flaw in Cisco IOS XE, provides the technical vector, and notes that a vendor fix has been released.

    0100041
    605 followersView on X
  • Infoflowcloud@infoflowcloud
    Disclosure

    🚨*CVE* CVE-2026-20084 A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between V… https://www.cve.org/CVERecord?id=CVE-2026-20084 ----- Traducción: CVE-2026-20084 Una… http://infoflow.cloud`

    Post summary

    The text announces a new vulnerability, CVE-2026-20084, in Cisco IOS XE's DHCP snooping feature, noting that it may allow unauthenticated attackers to cause BOOTP packets to be forwarded.

    0000035
    62 followersView on X
  • The Hacker Wire@TheHackerWire
    Disclosure

    🟠 CVE-2026-20084 - High A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a deni... https://www.thehackerwire.com/vulnerability/CVE-2026-20084/ https://t.co/pRYxF2ZrEs

    Post summary

    The tweet announces the discovery of a high‑severity vulnerability in Cisco IOS XE’s DHCP snooping, allowing unauthenticated remote attackers to forward BOOTP packets between VLANs.

    0000042
    145 followersView on X
CPE platform detail107 entries

107 of 107 entries

PartVendorProductVersionTarget SWTarget HW
OSciscoios_xe16.10.1--
OSciscoios_xe16.10.1e--
OSciscoios_xe16.10.1s--
OSciscoios_xe16.11.1--
OSciscoios_xe16.11.1b--
OSciscoios_xe16.11.1s--
OSciscoios_xe16.12.1--
OSciscoios_xe16.12.1c--
OSciscoios_xe16.12.1s--
OSciscoios_xe16.12.2--
OSciscoios_xe16.12.2s--
OSciscoios_xe16.12.3--
OSciscoios_xe16.12.3a--
OSciscoios_xe16.12.3s--
OSciscoios_xe16.12.4--
OSciscoios_xe16.12.4a--
OSciscoios_xe16.12.5--
OSciscoios_xe16.12.5b--
OSciscoios_xe16.12.6--
OSciscoios_xe16.12.6a--
OSciscoios_xe16.12.7--
OSciscoios_xe16.12.8--
OSciscoios_xe16.6.1--
OSciscoios_xe16.6.10--
OSciscoios_xe16.6.2--
OSciscoios_xe16.6.3--
OSciscoios_xe16.6.4--
OSciscoios_xe16.6.4a--
OSciscoios_xe16.6.5--
OSciscoios_xe16.6.6--
OSciscoios_xe16.6.7--
OSciscoios_xe16.6.8--
OSciscoios_xe16.6.9--
OSciscoios_xe16.7.1--
OSciscoios_xe16.8.1--
OSciscoios_xe16.8.1a--
OSciscoios_xe16.8.1s--
OSciscoios_xe16.9.1--
OSciscoios_xe16.9.1s--
OSciscoios_xe16.9.2--
OSciscoios_xe16.9.3--
OSciscoios_xe16.9.4--
OSciscoios_xe16.9.5--
OSciscoios_xe16.9.6--
OSciscoios_xe16.9.7--
OSciscoios_xe16.9.8--
OSciscoios_xe17.1.1--
OSciscoios_xe17.1.1s--
OSciscoios_xe17.1.1t--
OSciscoios_xe17.1.3--
OSciscoios_xe17.10.1--
OSciscoios_xe17.10.1b--
OSciscoios_xe17.11.1--
OSciscoios_xe17.12.1--
OSciscoios_xe17.12.1z5--
OSciscoios_xe17.12.2--
OSciscoios_xe17.12.3--
OSciscoios_xe17.12.4--
OSciscoios_xe17.12.5--
OSciscoios_xe17.13.1--
OSciscoios_xe17.14.1--
OSciscoios_xe17.15.1--
OSciscoios_xe17.15.2--
OSciscoios_xe17.15.2b--
OSciscoios_xe17.15.3--
OSciscoios_xe17.15.4--
OSciscoios_xe17.15.4d--
OSciscoios_xe17.16.1--
OSciscoios_xe17.17.1--
OSciscoios_xe17.18.1--
OSciscoios_xe17.2.1--
OSciscoios_xe17.2.1a--
OSciscoios_xe17.3.1--
OSciscoios_xe17.3.2--
OSciscoios_xe17.3.2a--
OSciscoios_xe17.3.3--
OSciscoios_xe17.3.4--
OSciscoios_xe17.3.5--
OSciscoios_xe17.3.6--
OSciscoios_xe17.3.7--
OSciscoios_xe17.3.8--
OSciscoios_xe17.3.8a--
OSciscoios_xe17.4.1--
OSciscoios_xe17.5.1--
OSciscoios_xe17.6.1--
OSciscoios_xe17.6.1y--
OSciscoios_xe17.6.2--
OSciscoios_xe17.6.3--
OSciscoios_xe17.6.4--
OSciscoios_xe17.6.5--
OSciscoios_xe17.6.5a--
OSciscoios_xe17.6.6--
OSciscoios_xe17.6.6a--
OSciscoios_xe17.6.7--
OSciscoios_xe17.6.8--
OSciscoios_xe17.7.1--
OSciscoios_xe17.8.1--
OSciscoios_xe17.9.1--
OSciscoios_xe17.9.2--
OSciscoios_xe17.9.3--
OSciscoios_xe17.9.4--
OSciscoios_xe17.9.4a--
OSciscoios_xe17.9.5--
OSciscoios_xe17.9.6--
OSciscoios_xe17.9.6a--
OSciscoios_xe17.9.7--
OSciscoios_xe17.9.8--

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