VulnSocial

CVE-2026-20279Patch

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20279 are related to improper access control issues that are grouped under the Common Weakness Enumeration (CWE) CWE-284.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-284

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 5 mentions across 4 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 3 signals
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 3d ago at 2 mentions (2026-09-02); latest day: 1
  • 5 total mentions across 4 days

Deep dive

Activity timeline5 mentions / 4d
01122Mentions · 2026-09-02: 2Mentions · 2026-09-03: 1Mentions · 2026-09-04: 1Mentions · 2026-09-06: 1Patch / Workaround · 2026-09-02: 1Patch / Workaround · 2026-09-04: 1Patch / Workaround · 2026-09-06: 1Technical Details · 2026-09-02: 1Technical Details · 2026-09-04: 1Technical Details · 2026-09-06: 109-0209-0309-0409-06
Signal classification2 categories
Patch
360.0%
Disclosure
240.0%
Referenced assets4 URLs
Classification over time
DateTotalLabels
2026-09-022
Disclosure1Patch1
2026-09-031
Disclosure1
2026-09-041
Patch1
2026-09-061
Patch1
Full discourse5 posts
  • GovCERT.CZ@GOVCERT_CZ
    Patch

    🚨 Upozorňujeme na kritické zranitelnosti v Cisco Nexus 9000 Series Switches a Cisco IOS XR Software, CVE-2026-20212, CVE-2026-20274 a CVE-2026-20279. Zranitelnost CVE-2026-20212 umožňuje neautentizovanému vzdálenému útočníkovi spustit libovolný kód s oprávněními root na switchích Cisco Nexus 9000. Zranitelnost CVE-2026-20274 zahrnuje chyby správy prostředků v Cisco IOS XR, které mohou způsobit poškození paměti, přetečení vyrovnávací paměti, přístup mimo její hranice nebo stav use-after-free. Zranitelnost CVE-2026-20279 je způsobena nesprávným řízením přístupu v Cisco IOS XR a může vést k neoprávněnému přístupu k chráněným funkcím. Úspěšné zneužití může mít za následek spuštění libovolného kódu, kompromitaci zařízení, neoprávněný přístup nebo narušení dostupnosti služeb. Dotčeny jsou příslušné verze switchů Cisco Nexus 9000 a softwaru Cisco IOS XR včetně Cisco IOS XR7 (LNT). 📌Doporučujeme aktualizovat na nejnovější verzi.

    Post summary

    The advisory lists three serious Cisco CVEs, explains their effects, and urges users to upgrade to the latest software release.

    01071912
    4.3K followersView on X
  • TheKnight7G@WH173H47
    Patch

    Cisco's internal review uncovered CVE-2026-20279, affecting IOS XR Software. Network admins should check impacted versions and consider patching to mitigate risks. https://nvd.nist.gov/vuln/detail/CVE-2026-20279 #CyberSecurity

    Post summary

    Cisco has identified CVE-2026-20279 in IOS XR Software and recommends administrators check for impacted versions and apply the available patch to mitigate potential risks.

    0001053
    21 followersView on X
  • Evan Kirstel #B2B #TechFluencer@EvanKirstel
    Patch

    Cisco's internal review of IOS XR produced two 9.8 criticals and a bundled fix release Cisco's security review of IOS XR found CVE-2026-20274 and CVE-2026-20279, both CVSS 9.8, plus three 8.8s, an 8.6 and an 8.2, all rolled into fixed releases Cisco strongly recommends. Separately, CVE-2026-20212 allows unauthenticated remote root on ten Nexus 9000 switch models through two TCP ports reachable in the default VRF. There is no permanent Nexus fix yet, only infrastructure ACLs. No exploitation has been observed. This is core carrier and data center gear. https://www.theregister.com/security/2026/09/04/cisco-searched-for-ios-xr-bugs-and-found-so-many-it-rolled-them-into-an-update-release/5294410

    Post summary

    Cisco’s internal review uncovered several critical CVEs in IOS XR and bundled them into a fixed release, while a Nexus 9000 model remains without a permanent fix, leaving only ACLworkarounds.

    00000850
    386.1K followersView on X
  • VulDB 🛡@vuldb
    Disclosure

    The severity is increased for this new vulnerability affecting Cisco IOS XR Software (CVE-2026-20279) https://vuldb.com/vuln/398239

    Post summary

    The statement announces that CVE-2026-20279, a newly disclosed vulnerability affecting Cisco IOS XR Software, now has increased severity, but offers no further technical details, PoC, or mitigation information.

    00000185
    2.3K followersView on X
  • Kaitan ID Security@KaitanSecurity
    Disclosure

    🚨 CRITICAL — CVE-2026-20279 As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering … CVSS 9.8 🔴 No patch yet Full analysis → https://sec.kaitan.id/cves/CVE-2026-20279 #Cisco #CyberSecurity #InfoSec

    Post summary

    Cisco has disclosed a critical vulnerability, CVE-2026-20279 (CVSS 9.8), stating no patch is yet available; no PoC or exploit details are provided.

    0000062
    83 followersView on X

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