CVE-2026-76505

HIGHPre-NVD 7.57.5
EchelonGraph scoreHIGH confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-21. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source

Also known asEUVD-2026-107359 (ENISA EUVD) · GHSA-5c8p-wwqr-9h22 (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and 9900 Series Aggregation Services Routers as well as Cisco ASR 9902 and 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause network processor (NP) errors, resulting in a line card reset or shutdown and a denial of service (DoS) condition.  This vulnerability is due to the incorrect handling of crafted IPv4 packets that are received on an affected line card interface and processed as for-us traffic. The issue can result in an NP reset, causing traffic loss on the affected line card while it recovers. Under repeated reset conditions, the network processor may enter a persistent shutdown state, in which case an explicit line card reload may be required to restore traffic. The vulnerability is within the IPv4 packet-processing path. Transit IPv4 traffic does not trigger this issue and IPv6 traffic cannot trigger it.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
49
EG Risk 49/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
41st
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-06). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.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 low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

October 21, 2026

Last Modified

October 22, 2026

Advisory Details (1)

Auto-updated Oct 21, 2026
Patch available.
Web page

Cisco IOS XR Software for ASR 9000 Series Routers IPv4 Unicast Packets Denial of Service Vulnerability

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr9k-tUyxcyXN

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 28× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-11-10 16:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-11-09 16:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-11-07 00:00 UTCEchelonGraph re-scored
  8. 2026-11-07 00:00 UTCGHSA enrichmentGHSA-5c8p-wwqr-9h22 · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-11-06 16:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-11-03 16:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-30 07:14 UTCEchelonGraph re-scored
  18. 2026-10-30 07:14 UTCGHSA enrichmentGHSA-5c8p-wwqr-9h22 · GitHub severity HIGH · GitHub CVSS 7.5
  19. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  23. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-25 14:02 UTCEchelonGraph re-scored
  25. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
Show 11 more
  1. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  3. 2026-10-22 14:28 UTCEchelonGraph re-scored
  4. 2026-10-22 14:28 UTCGHSA enrichmentGHSA-5c8p-wwqr-9h22 · GitHub severity HIGH · GitHub CVSS 7.5
  5. 2026-10-22 13:52 UTCEchelonGraph re-scored
  6. 2026-10-22 13:51 UTCGHSA enrichmentGHSA-5c8p-wwqr-9h22 · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-21 19:27 UTCEchelonGraph re-scored
  8. 2026-10-21 19:27 UTCGHSA enrichmentGHSA-5c8p-wwqr-9h22 · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-21 17:27 UTCEchelonGraph re-scored
  10. 2026-10-21 16:28 UTCEchelonGraph re-scoredFirst assessed: 7.5 HIGH
  11. 2026-10-21 16:25 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-76505?
CVE-2026-76505 is a high-severity vulnerability; its CVE record was published on October 21, 2026. A vulnerability in the IPv4 packet processing functionality of Cisco IOS XR Software that affects Cisco ASR 9000 and 9900 Series Aggregation Services Routers as well as Cisco ASR 9902 and 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause network…
When was the CVE record for CVE-2026-76505 published?
The CVE record for CVE-2026-76505 was published on October 21, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 22, 2026; the record at its source may have been updated since.
Is CVE-2026-76505 actively exploited?
CVE-2026-76505 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-76505?
CVE-2026-76505 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-76505?
A fix for CVE-2026-76505 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-76505 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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