A vulnerability in the handling of an Egress Packet Network Interface (EPNI) Aligner interrupt in Cisco IOS XR Software for Cisco Network Convergence System (NCS) 5500 Series with NC57 line cards and Cisco NCS 5700 Routers and Cisco IOS XR Software for Third Party Software could allow an unauthenticated, remote attacker to cause the network processing unit (NPU) and ASIC to stop processing, preventing traffic from traversing the interface. This vulnerability is due to the corruption of packets in specific cases when an EPNI Aligner interrupt is triggered while an affected device is experiencing heavy transit traffic. An attacker could exploit this vulnerability by sending a continuous flow of crafted packets to an interface of the affected device. A successful exploit could allow the attacker to cause persistent, heavy packet loss, resulting in a denial of service (DoS) condition. Note: If active exploitation of this vulnerability is suspected, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider. Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. This change was made because the affected device operates within a critical network segment where compromise could lead to significant disruption or exposure, thereby elevating the overall risk beyond the base technical severity.
CVE-2026-20118
“—” beside the score: it is equal to the CVSS score beside it.
Score 6.8 from GitHub Security Advisory published 2026-03-11. A secondary CVSS source baseline 6.8; sources differ by 0.0.
Also known asEUVD-2026-11224 (ENISA EUVD) · GHSA-vgpf-3m99-q785 (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
- CVSS v3
- 6.8
- EG Score
- 6.8MEDIUMmedium confidence
- EG Risk
- 31EG Risk 31/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity68% × 45%Impact severity (EG Severity): CVSS 6.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.3% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule. - EPSS PROB
- 0.3%
- EPSS %ILE
- 27th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (6.8): severity, escalated by confirmed exploitation. This CVE's 6.8 is its impact severity (EG Severity), not escalated.
- EG Severity
- 6.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says. In the directive's words, “Fix on system upgrade” means that, “unless conditions change”, the vulnerability “should be remediated the next time the vulnerable asset receives a scheduled major upgrade or rebuild”: its timelines are “dynamic as facts change”, and a KEV listing shortens them.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
March 11, 2026
Last Modified
June 17, 2026
Advisory Details (1)
Auto-updated Aug 4, 2026Cisco IOS XR Egress Packet Network Interface Aligner Interrupt Denial of Service Vulnerability
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrncs-epni-int-dos-TWMffUsNVendor Advisories for CVE-2026-20118(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 7× in last 7d / 37× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 111 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 11 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-10-25 14:44 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-10-23 05:51 UTCEG score recompute
- 2026-10-23 05:51 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-18 03:57 UTCEG score recompute
- 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Show 75 moreShow fewer
- 2026-10-12 16:24 UTCEG score recompute
- 2026-10-11 20:06 UTCEG score recompute
- 2026-10-11 17:19 UTCEG score recompute
- 2026-10-11 14:51 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-29 15:21 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-27 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 25th percentile
- 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-16 11:53 UTCEG score recompute
- 2026-08-16 11:53 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-14 07:51 UTCEG score recompute
- 2026-08-14 07:51 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-12 23:02 UTCEG score recompute
- 2026-08-12 23:02 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-11 21:52 UTCEG score recompute
- 2026-08-11 21:52 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-10 08:27 UTCEG score recompute
- 2026-08-10 08:27 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-09 07:32 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-07 18:19 UTCEG score recompute
- 2026-08-07 18:19 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-06 02:03 UTCEG score recompute
- 2026-08-06 02:03 UTCGHSA enrichmentGHSA-vgpf-3m99-q785 · GitHub CVSS 6.8
- 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 24th percentile
- 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.3% · 24th percentile
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-20118?
When was the CVE record for CVE-2026-20118 published?
Is CVE-2026-20118 actively exploited?
What is the CVSS score of CVE-2026-20118?
How do I remediate CVE-2026-20118?
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-20118
Is Your Infrastructure Affected by CVE-2026-20118?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.