CVE-2026-20213Patch(cisco / clamav)

LOWCVSS 7.5 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

Patch cisco clamav systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A vulnerability in the PE file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in PE files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains PE content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.

cisco CVEs Back to dashboard

1.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-clamav-88cFYyxR

Weakness type (CWE)

CWE-120

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.

clamav
secure_endpoint

Threat summary

Patch or workaround signal is available
7 mentions across 6 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 4 signals
Technical details provided in 7 signals
General: 2 classified signals
Disclosure: 1 classified signal
Peaked at 2 mentions on most recent observed day (2026-07-09)
7 total mentions across 6 days

Affected systems

Vendors

cisco clamav

Products

clamavsecure_endpoint

Deep dive

Activity timeline7 mentions / 6d

Signal classification3 categories

Patch

457.1%

General

228.6%

Disclosure

114.3%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-07-01	1	Disclosure1
2026-07-02	1	Patch1
2026-07-04	1	Patch1
2026-07-05	1	Patch1
2026-07-07	1	General1
2026-07-09	2	General1Patch1

Full discourse7 posts

connect24h@connect24h89d
Patch
ClamAVの7件は、AV本体よりメール経路の可用性リスクとして見るべきだ。CVE-2026-20213/20214/20215/20216/20217/20243/20244、CVSS 7.5。細工したPE、7z、ALZ、DMGなどの解析でscanner crash、scan skip、temporary storage枯渇が起き得る。現場では「入れているか」より、どこに組み込まれているかが厄介です。clamd/clamscan単体、メールGW、Cisco製品の同梱ClamAV、Docker imageを今日棚卸しし、1.5.3または1.4.5へ。scan error増加とtemp領域逼迫も見る。検知基盤が止まる事故は地味に痛い。 #セキュリティ
Post summary
The message focuses on the need to update ClamAV to versions 1.5.3 or 1.4.5 to mitigate seven CVEs that can cause crashes and storage exhaustion during file scanning.
10011438
4.2K followersView on X
ゆぅさん@YY2042427784d
General
【3軸解説】「シスコシステムズのCisco Secure Endpointにおける古典的バッファオーバーフローの脆弱性（CVE-2026-20213）」を、背景 / 目的 / 効果の 3 軸で読み解きます。背景/目的/効果の3軸で読み解きました。 #セキュリティ #若手コンサル ▶ 無料ツール WR-Analysis: https://www.intect-i.jp/tools/wr-analysis/?utm_source=sns&utm_medium=social&utm_campaign=wr_analysis
Post summary
The post provides a conceptual analysis of CVE‑2026‑20213, outlining background, purpose, and effect, but offers no PoC, exploit, patch, or proof of active exploitation.
0000091
841 followersView on X
iototsecnews@iototsecnews84d
Patch
ClamAV の脆弱性 CVE-2026-20213／20214／20215 が FIX：サービス拒否 (DoS) の可能性 https://iototsecnews.jp/2026/07/02/multiple-clamav-vulnerabilities-allow-remote-attacker-to-cause-a-dos-condition/ セキュリティの要となる ClamAV において、検査対象のデータを解析する内部処理の不備を原因とした深刻な問題が明らかになりました。この脆弱性 CVE-2026-20213／CVE-2026-20214／CVE-2026-20215 が悪用されると、悪意のファイルを読み込む際に保護システムが突然停止してしまう恐れがあります。特定の環境では端末自体が応答しなくなるなど、防衛体制に大きな穴が空くリスクを伴います。安全な運用を維持するための対応策として、開発元から配布されている最新のコネクタへの更新を早期に適用し、常に最新の防御状態を保つように心がけてください。 #Cisco #ClamAV #CVE202620213 #CVE202620214 #CVE202620215 #Vulnerability
Post summary
The article announces a DoS vulnerability in ClamAV (CVE‑2026‑20213/20214/20215) and urges users to update to the latest connector to prevent service disruption.
00000120
500 followersView on X
ゆぅさん@YY2042427786d
General
【3軸解説】「シスコシステムズのCisco Secure Endpointにおける古典的バッファオーバーフローの脆弱性（CVE-2026-20213）」を、背景 / 目的 / 効果の 3 軸で読み解きます。背景/目的/効果の3軸で読み解きました。 #セキュリティ #若手コンサル ▶ 無料ツール WR-Analysis: https://www.intect-i.jp/tools/wr-analysis/?utm_source=sns&utm_medium=social&utm_campaign=wr_analysis
Post summary
The tweet offers a concise explanation of a classic buffer‑overflow CVE in Cisco Secure Endpoint and links a free analysis tool, but it does not provide a PoC, exploit code, active exploitation evidence, or patch information.
0000072
841 followersView on X
Xavier Rivera@XavierRiveraX87d
Patch
ClamAV patched 7 vulnerabilities, including a heap buffer overflow in PE parsing (CVE-2026-20213) and a PeSpin unpacker bug in the codebase since 2005. If your mail gateway, endpoint tooling, or file upload stack runs ClamAV, update to 1.4.5 or 1.5.3.
Post summary
The text announces that ClamAV has patched CVE-2026-20213, specifically a heap buffer overflow in PE parsing, and advises users to update to the latest versions.
0000078
576 followersView on X
TECHEPAGES@techepages91d
Patch
🚨 Cisco warns of multiple high-severity ClamAV flaws (advisory cisco-sa-clamav-88cFYyxR) letting remote attackers crash the AV engine via malformed files. Key CVEs: - CVE-2026-20216 - CVE-2026-20213 - CVE-2026-20214 - CVE-2026-20215 - CVE-2026-20217 - CVE-2026-20243 - CVE-2026-20244 These vulnerabilities are fixed in ClamAV 1.5.3 / 1.4.5. Cisco Security 📁 Windows hit hardest (CVSS 7.5), endpoints may need a reboot. No workarounds; patch Secure Endpoint Connector now.
Post summary
Cisco alerts on multiple high‑severity ClamAV vulnerabilities (CVE‑2026‑20213/16/14/15/17/20243/20244) that allow attackers to crash the engine with malformed files; the bugs are fixed in ClamAV 1.5.3/1.4.5, so immediate patching is advised.
0000063
22 followersView on X
Kaitan ID Security@KaitanSecurity92d
Disclosure
⚠️ HIGH — CVE-2026-20213 ClamAV Vulnerabilities Affecting Cisco Products: July 2026 CVSS 7.5 Full analysis → https://sec.kaitan.id/cves/CVE-2026-20213 #Cisco #CyberSecurity #InfoSec
Post summary
A concise tweet announcing the CVE-2026-20213 ClamAV vulnerability affecting Cisco products, noting a CVSS score of 7.5 and linking to a full analysis page.
0000053
84 followersView on X

CPE platform detail4 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

4 of 4 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	cisco	secure_endpoint	-	linux	-
App	cisco	secure_endpoint	-	macos	-
App	cisco	secure_endpoint	-	windows	-
App	clamav	clamav	-	-	-

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What researchers are saying

CVE-2026-20213

connect24h[verified]@connect24hPatch

The message focuses on the need to update ClamAV to versions 1.5.3 or 1.4.5 to mitigate seven CVEs that can cause crashes and storage exhaustion during file scanning.

ゆぅさん[verified]@YY20424277General

The post provides a conceptual analysis of CVE‑2026‑20213, outlining background, purpose, and effect, but offers no PoC, exploit, patch, or proof of active exploitation.

ゆぅさん[verified]@YY20424277General

The tweet offers a concise explanation of a classic buffer‑overflow CVE in Cisco Secure Endpoint and links a free analysis tool, but it does not provide a PoC, exploit code, active exploitation evidence, or patch information.

Xavier Rivera[verified]@XavierRiveraXPatch

The text announces that ClamAV has patched CVE-2026-20213, specifically a heap buffer overflow in PE parsing, and advises users to update to the latest versions.

TECHEPAGES[verified]@techepagesPatch

Cisco alerts on multiple high‑severity ClamAV vulnerabilities (CVE‑2026‑20213/16/14/15/17/20243/20244) that allow attackers to crash the engine with malformed files; the bugs are fixed in ClamAV 1.5.3/1.4.5, so immediate patching is advised.

Kaitan ID Security[verified]@KaitanSecurityDisclosure

A concise tweet announcing the CVE-2026-20213 ClamAV vulnerability affecting Cisco products, noting a CVSS score of 7.5 and linking to a full analysis page.

iototsecnews@iototsecnewsPatch

The article announces a DoS vulnerability in ClamAV (CVE‑2026‑20213/20214/20215) and urges users to update to the latest connector to prevent service disruption.