CVE-2020-27736

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2022-05-24. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 3.6%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is referenced (a reference tagged "Patch", often a source commit), but no release containing it is confirmed — find the release that contains it; until it is applied, mitigate (WAF / firewall / segmentation).

A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.3), Nucleus ReadyStart V4 (All versions < V4.1.0), Nucleus Source Code (Versions including affected DNS modules), SIMOTICS CONNECT 400 (All versions < V0.5.0.0), TALON TC Compact (BACnet) (All versions < V3.5.5), TALON TC Modular (BACnet) (All versions < V3.5.5). The DNS domain name label parsing functionality does not properly validate the null-terminated name in DNS-responses. The parsing of malformed responses could result in a read past the end of an allocated structure. An attacker with a privileged position in the network could leverage this vulnerability to cause a denial-of-service condition or leak the read memory.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity65% × 45%
Exploitation4% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.
EPSS PROB
3.6%
EPSS %ILE
89th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is referenced, but no release containing it is confirmed. Check the referenced fix and the vendor's advisory for a release that contains it and apply that within your standard update timelines at low or medium mission impact and sooner than that at high; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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 22, 2021

Last Modified

November 21, 2024

References (6)

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 22× 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 147 total refreshes for this CVE.

  1. 2026-10-09 20:04 UTCEPSS rescore
  2. 2026-10-08 16:38 UTCEPSS rescore
  3. 2026-10-07 23:44 UTCEPSS rescore
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  7. 2026-09-30 15:17 UTCEG score recompute
  8. 2026-09-30 14:59 UTCEPSS rescore
  9. 2026-09-29 15:14 UTCEPSS rescore
  10. 2026-09-27 13:41 UTCEPSS rescore
  11. 2026-09-26 15:54 UTCEPSS rescore
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  1. 2026-09-05 15:24 UTCEPSS rescore
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  5. 2026-09-01 03:32 UTCEPSS rescore
  6. 2026-08-30 19:14 UTCEPSS rescore
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  8. 2026-08-27 14:21 UTCEPSS rescore
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  11. 2026-08-21 23:45 UTCEPSS rescore
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  19. 2026-08-13 21:57 UTCEPSS rescore
  20. 2026-08-12 13:47 UTCEPSS rescore
  21. 2026-08-09 13:43 UTCEPSS rescore
  22. 2026-08-08 16:33 UTCEPSS rescore
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  24. 2026-08-06 13:43 UTCEPSS rescore
  25. 2026-08-04 15:06 UTCEPSS rescore
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  27. 2026-08-02 02:23 UTCEPSS rescore
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  34. 2026-07-23 14:15 UTCEPSS rescore
  35. 2026-07-23 14:15 UTCEPSS rescore
  36. 2026-07-23 01:52 UTCEG score recompute
  37. 2026-07-22 22:38 UTCEG score recompute
  38. 2026-07-22 14:05 UTCEPSS rescore
  39. 2026-07-21 15:22 UTCEPSS rescore
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  41. 2026-07-20 17:04 UTCEPSS rescore
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  43. 2026-07-19 14:28 UTCEPSS rescore
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  45. 2026-07-19 02:26 UTCEPSS rescore
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  47. 2026-07-16 16:59 UTCEPSS rescore
  48. 2026-07-15 16:55 UTCEPSS rescore
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  50. 2026-07-15 01:57 UTCEPSS rescore
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  55. 2026-07-12 05:44 UTCEPSS rescore
  56. 2026-07-11 08:25 UTCEPSS rescore
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  58. 2026-07-09 19:07 UTCEPSS rescore
  59. 2026-07-08 15:12 UTCEPSS rescore
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  68. 2026-06-29 14:04 UTCEPSS rescore
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  71. 2026-06-27 03:06 UTCEPSS rescore
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  73. 2026-06-25 13:48 UTCEPSS rescore
  74. 2026-06-24 14:03 UTCEPSS rescore
  75. 2026-06-24 14:03 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-27736?
CVE-2020-27736 is a medium vulnerability published on April 22, 2021. A vulnerability has been identified in APOGEE PXC Compact (BACnet) (All versions < V3.5.5), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.20), APOGEE PXC Modular (BACnet) (All versions < V3.5.5), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.20), Nucleus NET (All versions), Nucleus…
When was CVE-2020-27736 disclosed?
CVE-2020-27736 was first published on April 22, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2020-27736 actively exploited?
CVE-2020-27736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.6% probability of exploitation in the next 30 days (89th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-27736?
CVE-2020-27736 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2020-27736?
A fix for CVE-2020-27736 is referenced (a reference tagged "Patch", often a source commit), but EchelonGraph has no release containing it on record. Check that reference and the vendor's advisory for a release that contains the fix and update to it; until then, restrict network exposure of the affected system or apply the vendor's mitigation.

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