CVE-2023-20191

MEDIUMNVD 5.85.8—
EchelonGraph scoreMEDIUM confidence

Score 5.8 from GitHub Security Advisory (severity: HIGH) published 2023-09-13. NVD baseline CVSS 5.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.8Exploit: 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 access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incomplete support for this feature. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device. There are workarounds that address this vulnerability. This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .

CVSS v3
5.8
EG Score
5.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity58% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

September 13, 2023

Last Modified

November 21, 2024

References (2)

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 47× 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 114 total refreshes for this CVE.

  1. 2026-07-26 14:52 UTCEPSS rescore
  2. 2026-07-26 14:52 UTCEPSS rescore
  3. 2026-07-25 14:16 UTCEPSS rescore
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  6. 2026-07-23 14:16 UTCEPSS rescore
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  8. 2026-07-23 02:18 UTCEG score recompute
  9. 2026-07-22 23:05 UTCEG score recompute
  10. 2026-07-22 14:06 UTCEPSS rescore
  11. 2026-07-21 15:23 UTCEPSS rescore
  12. 2026-07-20 17:05 UTCEPSS rescore
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  21. 2026-07-15 16:56 UTCEPSS rescore
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  24. 2026-07-13 22:28 UTCEPSS rescore
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  1. 2026-07-13 06:11 UTCEPSS rescore
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  17. 2026-06-30 23:21 UTCEPSS rescore
  18. 2026-06-29 14:04 UTCEPSS rescore
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  21. 2026-06-28 04:54 UTCEPSS rescore
  22. 2026-06-28 04:54 UTCEPSS rescore
  23. 2026-06-27 03:07 UTCEPSS rescore
  24. 2026-06-25 13:48 UTCEPSS rescore
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  26. 2026-06-24 14:03 UTCEPSS rescore
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  28. 2026-06-23 21:31 UTCEPSS rescore
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  36. 2026-06-19 19:24 UTCEPSS rescore
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  40. 2026-06-17 17:51 UTCEPSS rescore
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  44. 2026-06-16 17:51 UTCEPSS rescore
  45. 2026-06-15 17:47 UTCEPSS rescore
  46. 2026-06-14 23:16 UTCEPSS rescore
  47. 2026-06-13 22:59 UTCEPSS rescore
  48. 2026-06-12 23:10 UTCEPSS rescore
  49. 2026-06-11 13:59 UTCEPSS rescore
  50. 2026-06-11 13:58 UTCEPSS rescore
  51. 2026-06-10 22:17 UTCEPSS rescore
  52. 2026-06-10 13:21 UTCEPSS rescore
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  54. 2026-06-08 14:15 UTCEPSS rescore
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  56. 2026-06-07 15:23 UTCEPSS rescore
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  58. 2026-06-06 13:46 UTCEPSS rescore
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  60. 2026-06-05 22:46 UTCEPSS rescore
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  63. 2026-06-05 06:09 UTCEPSS rescore
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  67. 2026-06-02 20:12 UTCEPSS rescore
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  70. 2026-06-01 13:51 UTCEPSS rescore
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  72. 2026-05-31 22:29 UTCEPSS rescore
  73. 2026-05-31 22:29 UTCEPSS rescore
  74. 2026-05-31 22:29 UTCEPSS rescore
  75. 2026-05-31 00:15 UTCEPSS rescore

Frequently asked(5)

What is CVE-2023-20191?
CVE-2023-20191 is a medium vulnerability published on September 13, 2023. A vulnerability in the access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incomplete support for this feature. An attacker could exploit…
When was CVE-2023-20191 disclosed?
CVE-2023-20191 was first published in the National Vulnerability Database on September 13, 2023, 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-2023-20191 actively exploited?
CVE-2023-20191 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.7% of all scored CVEs.
What is the CVSS score of CVE-2023-20191?
CVE-2023-20191 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2023-20191?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-20191, 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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