CVE-2020-10255

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 2.7% (85th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.0EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.7%CVSS: 9.0Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

Modern DRAM chips (DDR4 and LPDDR4 after 2015) are affected by a vulnerability in deployment of internal mitigations against RowHammer attacks known as Target Row Refresh (TRR), aka the TRRespass issue. To exploit this vulnerability, the attacker needs to create certain access patterns to trigger bit flips on affected memory modules, aka a Many-sided RowHammer attack. This means that, even when chips advertised as RowHammer-free are used, attackers may still be able to conduct privilege-escalation attacks against the kernel, conduct privilege-escalation attacks against the Sudo binary, and achieve cross-tenant virtual-machine access by corrupting RSA keys. The issue affects chips produced by SK Hynix, Micron, and Samsung. NOTE: tracking DRAM supply-chain issues is not straightforward because a single product model from a single vendor may use DRAM chips from different manufacturers.

CVSS v3
9.0
EG Score
9.0CRITICALmedium confidence
EG Risk
46
EG Risk 46/100CISA 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
Severity90% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
2.7%
EPSS %ILE
85th
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 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

March 10, 2020

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Jul 26, 2026
No fix on record yet.
generic

Post / X

https://twitter.com/antumbral/status/1237425959407513600
generic

Poor Rowhammer Fixes On DDR4 DRAM Chips Re-Enable Bit Flipping Attacks

https://thehackernews.com/2020/03/rowhammer-vulnerability-ddr4-dram.html
generic

GitHub - vusec/trrespass: TRRespass · GitHub

https://github.com/vusec/trrespass
generic
https://download.vusec.net/papers/trrespass_sp20.pdf
generic

TRRespass - vusec

https://www.vusec.net/projects/trrespass/
generic

VUSec on X: "Remember #Rowhammer? Old variants won't work on recent DDR4 chips. Introducing #TRRespass, a Rowhammer fuzzer that finds new Many-Sided #Rowhammer patterns to bypass in-DRAM #TRR on "Rowhammer-free" DIMMs of all vendors. Coming soon: app to test your phone https://t.co/h4X7N69Rgs" / X

https://twitter.com/vu5ec/status/1237399112590467072

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 26× 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 157 total refreshes for this CVE.

  1. 2026-10-09 20:03 UTCEPSS rescore
  2. 2026-10-08 16:38 UTCEPSS rescore
  3. 2026-10-07 23:43 UTCEPSS rescore
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  8. 2026-09-30 14:59 UTCEPSS rescore
  9. 2026-09-30 10:31 UTCEG score recompute
  10. 2026-09-27 13:40 UTCEPSS rescore
  11. 2026-09-26 15:54 UTCEPSS rescore
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  13. 2026-09-24 13:59 UTCEPSS rescore
  14. 2026-09-22 14:43 UTCEPSS rescore
  15. 2026-09-21 20:28 UTCEPSS rescore
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  1. 2026-09-11 09:32 UTCEPSS rescore
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  3. 2026-09-06 13:44 UTCEPSS rescore
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  9. 2026-08-30 19:14 UTCEPSS rescore
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  11. 2026-08-28 21:37 UTCEPSS rescore
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  22. 2026-08-13 21:57 UTCEPSS rescore
  23. 2026-08-12 13:47 UTCEPSS rescore
  24. 2026-08-08 16:33 UTCEPSS rescore
  25. 2026-08-07 16:23 UTCEPSS rescore
  26. 2026-08-06 13:43 UTCEPSS rescore
  27. 2026-08-05 19:14 UTCEPSS rescore
  28. 2026-08-04 15:06 UTCEPSS rescore
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  39. 2026-07-23 14:15 UTCEPSS rescore
  40. 2026-07-23 14:15 UTCEPSS rescore
  41. 2026-07-23 01:48 UTCEG score recompute
  42. 2026-07-22 22:32 UTCEG score recompute
  43. 2026-07-22 14:05 UTCEPSS rescore
  44. 2026-07-21 15:22 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-19 14:28 UTCEPSS rescore
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  49. 2026-07-19 02:26 UTCEPSS rescore
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  51. 2026-07-18 10:02 UTCEPSS rescore
  52. 2026-07-16 16:59 UTCEPSS rescore
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  55. 2026-07-13 22:27 UTCEPSS rescore
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  74. 2026-06-28 14:05 UTCEPSS rescore
  75. 2026-06-28 04:54 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-10255?
CVE-2020-10255 is a critical vulnerability published on March 10, 2020. Modern DRAM chips (DDR4 and LPDDR4 after 2015) are affected by a vulnerability in deployment of internal mitigations against RowHammer attacks known as Target Row Refresh (TRR), aka the TRRespass issue. To exploit this vulnerability, the attacker needs to create certain access patterns to trigger…
When was CVE-2020-10255 disclosed?
CVE-2020-10255 was first published on March 10, 2020, 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-2020-10255 actively exploited?
CVE-2020-10255 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.7% probability of exploitation in the next 30 days (85th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2020-10255?
CVE-2020-10255 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2020-10255?
No fix for CVE-2020-10255 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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