CVE-2020-3156

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under NVD CVSS v3. EPSS exploit probability: 1.1%, top 39% of all CVEs by exploit prediction. 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
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.1Exploit: None knownExposed: 0

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

A vulnerability in the logging component of Cisco Identity Services Engine could allow an unauthenticated remote attacker to conduct cross-site scripting attacks. The vulnerability is due to the improper validation of endpoint data stored in logs used by the web-based interface. An attacker could exploit this vulnerability by sending malicious endpoint data to the targeted system. An exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or to access sensitive, browser-based information.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

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
Severity61% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
62%
KEV
Not listed

Published

February 19, 2020

Last Modified

November 21, 2024

References (2)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 27× 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 115 total refreshes for this CVE.

  1. 2026-08-21 23:45 UTCEPSS rescore
  2. 2026-08-20 22:52 UTCEPSS rescore
  3. 2026-08-19 17:00 UTCEPSS rescore
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  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:52 UTCEG score recompute
  3. 2026-07-22 22:39 UTCEG score recompute
  4. 2026-07-22 14:05 UTCEPSS rescore
  5. 2026-07-21 15:22 UTCEPSS rescore
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  21. 2026-07-12 05:44 UTCEPSS rescore
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  24. 2026-07-09 19:07 UTCEPSS rescore
  25. 2026-07-08 15:12 UTCEPSS rescore
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  41. 2026-06-23 21:31 UTCEPSS rescore
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  43. 2026-06-22 14:23 UTCEPSS rescore
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  45. 2026-06-21 14:54 UTCEPSS rescore
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  47. 2026-06-21 01:57 UTCEPSS rescore
  48. 2026-06-19 19:24 UTCEPSS rescore
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  50. 2026-06-18 17:50 UTCEPSS rescore
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  52. 2026-06-17 17:50 UTCEPSS rescore
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  54. 2026-06-15 17:46 UTCEPSS rescore
  55. 2026-06-14 23:15 UTCEPSS rescore
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  57. 2026-06-12 23:10 UTCEPSS rescore
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  73. 2026-06-02 20:11 UTCEPSS rescore
  74. 2026-06-02 20:11 UTCEPSS rescore
  75. 2026-06-01 13:50 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2020-3156?
CVE-2020-3156 is a medium vulnerability published on February 19, 2020. A vulnerability in the logging component of Cisco Identity Services Engine could allow an unauthenticated remote attacker to conduct cross-site scripting attacks. The vulnerability is due to the improper validation of endpoint data stored in logs used by the web-based interface. An attacker could…
When was CVE-2020-3156 disclosed?
CVE-2020-3156 was first published in the National Vulnerability Database on February 19, 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-2020-3156 actively exploited?
CVE-2020-3156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 38.1% of all scored CVEs.
What is the CVSS score of CVE-2020-3156?
CVE-2020-3156 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2020-3156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-3156, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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