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Vulnerability record · CVE-2020-11503 · published 18 June 2020

CVE-2020-11503: Sophos sfos out-of-bounds write vulnerability

Sophos · Sfos

A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.

9.8 CVSS 3.1 Critical EPSS 1.4% · top 27.8% CWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 7.5
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A heap-based buffer overflow in the awarrensmtp component of Sophos XG Firewall v17.5 MR11 and older potentially allows an attacker to run arbitrary code remotely.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://community.sophos.com/b/security-blog/posts/advisory-potential-rce-through-heap-overflow-in-awarrensmtp-cve-2020- Vendor Advisory
https://community.sophos.com/b/security-blog/posts/advisory-potential-rce-through-heap-overflow-in-awarrensmtp-cve-2020- Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-1040Sophos Firewall auth bypass in User Portal and Webadmin leads to RCESophos Firewall v18.5 MR3 and older contain an authentication bypass in the User Portal and Webadmin that lets a remote attacker execute code. The fl…KEVEPSS 100%analysed9.8CVE-2020-12271Sophos XG Firewall SFOS SQL Injection Leading to RCESophos XG Firewall devices running SFOS 17.0, 17.1, 17.5, and 18.0 before 2020-04-25 contain a SQL injection flaw in the administration (HTTPS) servi…KEVEPSS 42%analysed8.8CVE-2018-16117Sophos sfos os command injection vulnerabilityA shell escape vulnerability in /webconsole/Controller in Admin Portal of Sophos XG firewall 17.0.8 MR-8 allow remote authenticated attackers to exec…EPSS 44%8.8CVE-2018-16116Sophos sfos sql injection vulnerabilitySQL injection vulnerability in AccountStatus.jsp in Admin Portal of Sophos XG firewall 17.0.8 MR-8 allow remote authenticated attackers to execute ar…EPSS 1.9%8.1CVE-2018-16118Sophos sfos os command injection vulnerabilityA shell escape vulnerability in /webconsole/APIController in the API Configuration component of Sophos XG firewall 17.0.8 MR-8 allows remote attacker…EPSS 3.7%6.1CVE-2017-18014Sophos sfos cross-site scripting vulnerabilityAn NC-25986 issue was discovered in the Logging subsystem of Sophos XG Firewall with SFOS before 17.0.3 MR3. An unauthenticated user can trigger a pe…EPSS 2.3%5.3CVE-2022-0331Sophos sfos vulnerabilityAn information disclosure vulnerability in Webadmin allows an unauthenticated remote attacker to read the device serial number in Sophos Firewall ver…EPSS 1.5%8.8CVE-2026-53266Linux kernel ebtables SNAT out-of-bounds write in ARP rewriteThe ebtables SNAT target rewrites the ARP sender hardware address via skb_store_bits() without first making that range writable. When the ARP SHA byt…KEVEPSS 0.65%analysed

Source: NIST National Vulnerability Database (record CVE-2020-11503), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.