7.5

CVE-2026-20243: cisco cisco secure endpoint Classic Buffer Overflow

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-20243DEBIAN-CVE-2026-20243
Published 01-07-2026Last modified 01-07-2026
Open JSON

Vulnerability summary

CVE-2026-20243 is a high (CVSS 7.5) Classic Buffer Overflow vulnerability in cisco cisco secure endpoint. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.57%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 8
MGASA-2026-0271OPENSUSE-SU-2026:11182-1OPENSUSE-SU-2026:21252-1SUSE-SU-2026:22574-1SUSE-SU-2026:2833-1SUSE-SU-2026:2834-1

Timeline

  1. 01-07-2026
    PublishedVulnerability first disclosed.
  2. 01-07-2026
    Last modifiedVulnerability information updated.

Description

A vulnerability in the ALZ 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 ALZ 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 ALZ 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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

46%

Versus all other CVEs

30-day change

0.00 pp

From 0.57% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.57%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco2 products
  • cisco secure endpoint7.0.5 | 6.2.19 | 7.3.3 | 7.2.13 | 6.1.5 | 6.3.1 | 6.2.5 | 7.3.5 | 6.2.1 | 7.2.7 | 7.1.1 | 6.3.5 | 6.2.9 | 7.3.1 | 6.1.7 | 7.2.11 | 7.2.3 | 7.1.5 | 6.3.3 | 7.3.9 | 6.2.3 | 6.1.9 | 6.0.9 | 7.2.5 | 6.0.7 | 6.3.7 | 1.12.3 | 1.8.0 | 1.11.1 | 1.12.4 | 1.10.0 | 1.12.0 | 1.8.1 | 1.10.1 | 1.12.1 | 1.12.6 | 1.14.0 | 1.10.2 | 1.12.7 | 1.12.2 | 1.6.0 | 1.9.0 | 1.11.0 | 1.7.0 | 1.13.0 | 1.8.4 | 1.13.1 | 1.9.1 | 1.12.5 | 1.13.2 | 8.1.7.21512 | 8.1.7 | 8.1.5 | 8.1.3.21242 | 8.1.3 | 8.1.5.21322 | 8.1.7.21417 | 1.14.1 | 1.15.1 | 1.15.2 | 1.15.3 | 1.15.4 | 1.15.5 | 1.15.6 | 1.16.0 | 1.16.1 | 1.16.2 | 1.16.3 | 1.18.0 | 1.18.1 | 1.20.0 | 1.21.0 | 1.21.1 | 1.21.2 | 1.21.3 | 1.22.0 | 1.22.1 | 1.22.2 | 1.22.3 | 1.22.4 | 1.24.0 | 1.24.1 | 1.24.2 | 1.24.3 | 1.24.4 | 1.26.0 | 1.24.5 | 1.26.1 | 1.27.0 | 1.15.0 | 1.17.0 | 1.17.1 | 1.17.2 | 1.19.0 | 1.20.1 | 1.20.2 | 1.20.3 | 1.20.4 | 1.20.5 | 1.20.6 | 1.23.0 | 1.23.1 | 1.20.7 | 1.20.8 | 1.25.0 | 1.25.1 | 1.25.2 | 1.27.1 | 1.27.2 | 7.3.13 | 7.3.15 | 7.4.1 | 7.4.1.20425 | 7.4.1.20439 | 7.4.3 | 7.4.3.20679 | 7.4.5 | 7.5.1.20813 | 7.5.1.20833 | 7.5.3 | 7.5.5 | 8.0.1.21160 | 8.0.1.21164 | 7.5.7 | 7.5.9 | 7.5.11 | 8.1.7.21585 | 7.5.13.21586 | 7.5.13.21598 | 8.2.1.21612 | 8.2.1.21650 | 7.5.15.21611 | 7.5.17.21680 | 8.2.3.30119 | 8.2.4.30130 | 8.4.0 | 7.5.19 | 8.4.1.30298 | 8.4.2.30317 | 8.4.1.30307 | 7.5.20 | 8.4.3 | 8.4.4.30419 | 8.4.4.30467 | 7.5.21.21732 | 8.4.5.30483
  • secure_endpoint< 1.27.2 | < 1.29.0 | < 8.6.2
Clamav1 product
  • clamav≥ 1.4.0, < 1.4.5 | ≥ 1.5.0, < 1.5.3
Debian1 product
  • clamavAll versions (No fix recorded) | < 1.4.5+dfsg-1
Ubuntu1 product
  • clamavAll versions (No fix recorded) | < 1.5.3+dfsg-0ubuntu0.22.04.2 | < 1.5.3+dfsg-0ubuntu0.24.04.1 | < 1.5.3+dfsg-0ubuntu0.26.04.1

4 vendors · 5 products

References

7 links