CVE-2020-26144 — Improper Input Validation in Arista C-100 Firmware

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (Arista C-100 Firmware, Arista C-110 Firmware, Arista C-120 Firmware…).
2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
3. EPSS ahead of 92% of scored CVEs: prioritize it in the patch queue.
4. Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-20 · Improper Input Validation

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 4.91%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Not enough vector or weakness data: use the affected application’s logs as a starting point.

Timeline

What happened to this CVE, newest first.

• 2026
• SSVC assessment updated
  Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 13, 2026
• CVSS changed · 6.5
  Oct 13, 2026 · NIST National Vulnerability Database
• Source status changed · → Modified
  Oct 13, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 13, 2026 · NIST National Vulnerability Database
• 2021
• CVE published
  May 11, 2021 · mitre

Source activity

Repeated readings are counted rather than listed.

• 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

8 on the record

• www.fragattacks.com
  Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
• github.com/vanhoefm/fragattacks/blob/master/SUMMARY.md
  Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/pdf/ssa-913875.pdf
  Third Party Advisory, x_refsource_CONFIRM, NIST National Vulnerability Database
• www.openwall.com/lists/oss-security/2021/05/11/12
  Mailing List, Third Party Advisory, mailing-list, x_refsource_MLIST, NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/html/ssa-019200.html
  NIST National Vulnerability Database
• www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advi
  Third Party Advisory, x_refsource_MISC, NIST National Vulnerability Database
• cert-portal.siemens.com/productcert/html/ssa-913875.html
  NIST National Vulnerability Database
• tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epc
  Third Party Advisory, vendor-advisory, x_refsource_CISCO, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2020-26140 Use of a Broken or Risky Cryptographic Algorithm in Alfa Awus036h Firmware May 11, 2021
• Low CVE-2020-24588 The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired... May 11, 2021

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2020-26144 is "Improper Input Validation in Arista C-100 Firmware", rated Medium. It affects C-100 Firmware (Arista); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.5 describes technical severity. EPSS 4.91% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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