CVE-2020-5135Active Exploitation(sonicwall / sonicos)

LOWCVSS 9.8 · CRITICALCISA KEV

Exploitation ongoing with high activity in latest observed window (1 mentions)

Immediate actions

  • Prioritize remediation for sonicwall sonicos systems immediately
  • Assume compromise if assets are exposed
  • Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD description

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.

3.5/ 10 priority

Sources & remediation

Listed in the CISA Known Exploited Vulnerabilities catalog. Federal remediation due date: 2022-04-05. Apply updates per vendor instructions.

Weakness type (CWE)
CWE-120

Priority

LOW

Exploitation

ACTIVE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

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

  • sonicos
  • sonicosv

Threat summary

  • Active exploitation appears in 1 classified signals
  • 1 mentions across 1 observed day

What's happening

  • Active exploitation reported across 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
Products
sonicossonicosv

1 version affected across 2 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-22: 1Active Exploitation · 2026-08-22: 108-22
Signal classification1 categories
Active Exploitation
1100.0%
Full discourse1 post
  • kokumօtօ@__kokumoto
    Active Exploitation

    米国サイバーセキュリティ・社会基盤安全保障庁(CISA)の既知の悪用された脆弱性カタログが更新。以下脆弱性について悪用が確認された。 - CVE-2021-43226 (Windows) - CVE-2020-5135 (SonicOS) - CVE-2012-0158 (Windows) https://t.co/36dA3GHlV2

    Post summary

    CISA updates its known exploited vulnerability catalog, confirming active exploitation of CVE-2021-43226, CVE-2020-5135, and CVE-2012-0158.

    00000725
    7.7K followersView on X
CPE platform detail3 entries

3 of 3 entries

PartVendorProductVersionTarget SWTarget HW
OSsonicwallsonicos---
OSsonicwallsonicos7.0.0.0--
OSsonicwallsonicosv---

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