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CVE-2020-12271

CRITICAL
9.8
CVSS Score
Published: April 27, 2020 at 04:00 AM UTC
Updated: June 17, 2026 at 02:51 AM UTC
2 products affected across 1 vendorSfosXg Firewall

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Severity
CRITICAL9.8
Exploitation
CISA KEV
Exploit prediction
EPSS 42%
SSVC
Active

Actively Exploited

CISA Known Exploited Vulnerabilities (KEV) Catalog

EPSS Score42.4%

EPSS (Exploit Prediction Scoring System) estimates a 42.4% chance this CVE is exploited in the wild within the next 30 days — higher than 99% of all CVEs. It complements CVSS: a high EPSS on a mid-severity CVE can still be urgent.

Sophos Firewall operating system (SFOS) firmware contains a SQL injection vulnerability when configured with either the administration (HTTPS) service or the User Portal is exposed on the WAN zone. Successful exploitation may cause remote code execution to exfiltrate usernames and hashed passwords for the local device admin(s), portal admins, and user accounts used for remote access (but not external Active Directory or LDAP passwords).

Required Action
Apply updates per vendor instructions.
Ransomware Use
Known
Added to KEV
Nov 3, 2021
Remediation Due
May 3, 2022
1639 days overdue
Notes
https://nvd.nist.gov/vuln/detail/CVE-2020-12271

Description

A SQL injection issue was found in SFOS 17.0, 17.1, 17.5, and 18.0 before 2020-04-25 on Sophos XG Firewall devices, as exploited in the wild in April 2020. This affected devices configured with either the administration (HTTPS) service or the User Portal exposed on the WAN zone. A successful attack may have caused remote code execution that exfiltrated usernames and hashed passwords for the local device admin(s), portal admins, and user accounts used for remote access (but not external Active Directory or LDAP passwords)

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Sfos· Sophos
95%
17.017.117.518.0
sophos-xg-firewall (environment)
Xg Firewall· Sophosdevice
80%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

x_refsource_MISCVendor Advisory
Source: [email protected]
https://community.sophos.com/kb/en-us/135412
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://cwe.mitre.org/data/definitions/89.html
x_refsource_MISCExploitVendor Advisory
Source: [email protected]
https://news.sophos.com/en-us/2020/04/26/asnarok/
US Government Resource
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-12271

SSVC — Action Prioritization

SSVCActiveAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICAL[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-89

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