CVE-2020-12271

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.8EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 42%CVSS: 9.8Exploit: cisa kev · ssvc active · kev ransomware · epss top5pctExposed services: Not assessed

A fix is available — apply it.

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)

CVSS v3
9.8
EG Score
9.8CRITICALhigh confidence
EG Risk
99
EG Risk 99/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low mission impact; Act at medium or high.
Action: A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.
EPSS PROB
42%
EPSS %ILE
98th
KEV
⚠ Exploited

CISA SSVCAttend at low mission impact; Act at medium or high.

A fix is available. Apply it sooner than your standard update timelines at low mission impact and as soon as possible at medium or high.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 27, 2020

Last Modified

November 7, 2025

Advisory Details (4)

Auto-updated Oct 1, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-12271
generic🟡 PoC Available

“Asnarök” Trojan targets firewalls | SOPHOS

https://news.sophos.com/en-us/2020/04/26/asnarok/
generic🔴 Active Exploitation

CWE - CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') (4.20)

https://cwe.mitre.org/data/definitions/89.html
generic
https://community.sophos.com/kb/en-us/135412

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 54× in last 7d / 249× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,039 total refreshes for this CVE.

  1. 2026-10-05 21:51 UTCGHSA enrichment
  2. 2026-10-05 18:01 UTCEG score recompute
  3. 2026-10-05 18:01 UTCGHSA enrichment
  4. 2026-10-05 17:39 UTCEPSS rescore
  5. 2026-10-05 14:11 UTCGHSA enrichment
  6. 2026-10-05 10:20 UTCGHSA enrichment
  7. 2026-10-05 06:30 UTCGHSA enrichment
  8. 2026-10-05 02:39 UTCGHSA enrichment
  9. 2026-10-04 22:49 UTCGHSA enrichment
  10. 2026-10-04 18:59 UTCGHSA enrichment
  11. 2026-10-04 15:08 UTCGHSA enrichment
  12. 2026-10-04 11:15 UTCGHSA enrichment
  13. 2026-10-04 07:25 UTCGHSA enrichment
  14. 2026-10-04 03:34 UTCGHSA enrichment
  15. 2026-10-03 23:43 UTCGHSA enrichment
  16. 2026-10-03 19:52 UTCGHSA enrichment
  17. 2026-10-03 16:02 UTCEG score recompute
  18. 2026-10-03 16:02 UTCGHSA enrichment
  19. 2026-10-03 14:22 UTCEPSS rescore
  20. 2026-10-03 12:12 UTCGHSA enrichment
  21. 2026-10-03 08:21 UTCGHSA enrichment
  22. 2026-10-03 04:29 UTCGHSA enrichment
  23. 2026-10-03 00:38 UTCGHSA enrichment
  24. 2026-10-02 20:48 UTCGHSA enrichment
  25. 2026-10-02 16:57 UTCEG score recompute
Show 75 more
  1. 2026-10-02 16:57 UTCGHSA enrichment
  2. 2026-10-02 13:07 UTCGHSA enrichment
  3. 2026-10-02 09:15 UTCGHSA enrichment
  4. 2026-10-02 05:25 UTCGHSA enrichment
  5. 2026-10-02 01:33 UTCGHSA enrichment
  6. 2026-10-01 21:43 UTCEG score recompute
  7. 2026-10-01 21:43 UTCGHSA enrichment
  8. 2026-10-01 17:51 UTCGHSA enrichment
  9. 2026-10-01 14:01 UTCGHSA enrichment
  10. 2026-10-01 10:11 UTCGHSA enrichment
  11. 2026-10-01 06:21 UTCGHSA enrichment
  12. 2026-10-01 02:31 UTCGHSA enrichment
  13. 2026-09-30 22:40 UTCGHSA enrichment
  14. 2026-09-30 18:50 UTCGHSA enrichment
  15. 2026-09-30 15:00 UTCEG score recompute
  16. 2026-09-30 15:00 UTCGHSA enrichment
  17. 2026-09-30 14:59 UTCEPSS rescore
  18. 2026-09-30 11:09 UTCGHSA enrichment
  19. 2026-09-30 07:18 UTCGHSA enrichment
  20. 2026-09-30 03:27 UTCGHSA enrichment
  21. 2026-09-29 23:36 UTCGHSA enrichment
  22. 2026-09-29 19:46 UTCGHSA enrichment
  23. 2026-09-29 15:54 UTCEG score recompute
  24. 2026-09-29 15:54 UTCGHSA enrichment
  25. 2026-09-29 12:03 UTCGHSA enrichment
  26. 2026-09-29 08:12 UTCGHSA enrichment
  27. 2026-09-29 04:22 UTCGHSA enrichment
  28. 2026-09-29 00:31 UTCEG score recompute
  29. 2026-09-29 00:31 UTCGHSA enrichment
  30. 2026-09-28 20:40 UTCGHSA enrichment
  31. 2026-09-28 16:50 UTCGHSA enrichment
  32. 2026-09-28 13:00 UTCGHSA enrichment
  33. 2026-09-28 09:09 UTCGHSA enrichment
  34. 2026-09-28 05:18 UTCGHSA enrichment
  35. 2026-09-28 01:28 UTCGHSA enrichment
  36. 2026-09-27 21:51 UTCCISA KEV update
  37. 2026-09-27 21:37 UTCGHSA enrichment
  38. 2026-09-27 17:47 UTCGHSA enrichment
  39. 2026-09-27 13:56 UTCEG score recompute
  40. 2026-09-27 13:56 UTCGHSA enrichment
  41. 2026-09-27 13:40 UTCEPSS rescore
  42. 2026-09-27 10:04 UTCGHSA enrichment
  43. 2026-09-27 06:14 UTCGHSA enrichment
  44. 2026-09-27 02:23 UTCGHSA enrichment
  45. 2026-09-26 22:33 UTCGHSA enrichment
  46. 2026-09-26 18:41 UTCEG score recompute
  47. 2026-09-26 18:41 UTCGHSA enrichment
  48. 2026-09-26 15:54 UTCEPSS rescore
  49. 2026-09-26 14:50 UTCGHSA enrichment
  50. 2026-09-26 10:58 UTCGHSA enrichment
  51. 2026-09-26 07:03 UTCGHSA enrichment
  52. 2026-09-26 03:12 UTCEG score recompute
  53. 2026-09-26 03:12 UTCGHSA enrichment
  54. 2026-09-26 00:20 UTCEPSS rescore
  55. 2026-09-25 23:21 UTCGHSA enrichment
  56. 2026-09-25 19:35 UTCCISA KEV update
  57. 2026-09-25 19:27 UTCGHSA enrichment
  58. 2026-09-25 15:36 UTCGHSA enrichment
  59. 2026-09-25 14:55 UTCCISA KEV update
  60. 2026-09-25 11:44 UTCGHSA enrichment
  61. 2026-09-25 07:53 UTCGHSA enrichment
  62. 2026-09-25 04:03 UTCGHSA enrichment
  63. 2026-09-25 00:13 UTCGHSA enrichment
  64. 2026-09-24 20:22 UTCGHSA enrichment
  65. 2026-09-24 19:31 UTCCISA KEV update
  66. 2026-09-24 16:31 UTCEG score recompute
  67. 2026-09-24 16:31 UTCGHSA enrichment
  68. 2026-09-24 13:59 UTCEPSS rescore
  69. 2026-09-24 12:40 UTCGHSA enrichment
  70. 2026-09-24 08:49 UTCGHSA enrichment
  71. 2026-09-24 04:58 UTCGHSA enrichment
  72. 2026-09-24 01:07 UTCGHSA enrichment
  73. 2026-09-23 21:17 UTCGHSA enrichment
  74. 2026-09-23 17:27 UTCEG score recompute
  75. 2026-09-23 17:27 UTCGHSA enrichment

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Frequently asked(6)

What is CVE-2020-12271?
CVE-2020-12271 is a critical vulnerability published on April 27, 2020. 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…
When was CVE-2020-12271 disclosed?
CVE-2020-12271 was first published on April 27, 2020, with the most recent update on November 7, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-12271 actively exploited?
Yes. CISA added CVE-2020-12271 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Sophos SFOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. A fix is available. Apply it.
What is the CVSS score of CVE-2020-12271?
CVE-2020-12271 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2020-12271?
CVE-2020-12271 affects Sophos SFOS.
How do I remediate CVE-2020-12271?
A fix for CVE-2020-12271 is available: update to the fixed version the vendor names in its advisory.

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