Page generated: 06 Nov 2026, 03:50 UTC
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CVE-2026-20043

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple interna…

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As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco owned Open Source Snort 3 Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20043 are related to issues concerning out-of-bounds writes that are grouped under the Common Weakness Enumeration (CWE) Base CWE-787.
CVSS 9.0 (CRITICAL)

Attention and evidence

HYPE SCORE
0.6/10
REALITY · THREAT PRIORITY
3.2/10
General review priority; not probability

Evidence confidence: Insufficient evidence

Why this priority?
  • Technical severity: CVSS 9: +3.15
  • Fresh EPSS: 0.36%: +0.01

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 5 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
10/100
Grounded branding (15%)
0/100
HYPE TOTAL6/100

Sources and documents

ZDI: Published Advisories
Technical advisory · 03 Nov 2026, 06:00 · ZDI-26-867: Cisco Snort sf_unfold_header Out-Of-Bounds Write Remote Code Execution Vulnerability
Cisco Security Advisory
Technical advisory · 22 Oct 2026, 19:03 · Multiple Cisco Products Snort 3 Security Hardening Release: October 2026
Cisco Security Advisory
Press · 22 Oct 2026, 19:03 · Multiple Cisco Products Snort 3 Security Hardening Release: October 2026
Cisco Security Advisory
Technical advisory · 21 Oct 2026, 16:09 · Cisco Advance Notification for Publication of October 21, 2026, Security Advisories
Cisco Security Advisory
Press · 21 Oct 2026, 16:09 · Cisco Advance Notification for Publication of October 21, 2026, Security Advisories

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.6 · reality 3.2 (2026-11-02 15:14). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs. Published 15 days ago. Exploitation evidence usually takes weeks to show up: a low reality score can mean there is no data yet, not that the flaw is mild.

Evidence in context

Confidence in exploitation evidence
Insufficient evidence
Priority basis
Exploitation in attacks unconfirmed; CVSS 9; EPSS 0.4%
Attention, last 30 days
2 distinct story titles; 2 press documents; 1 publisher domains.
Technical potential
network access, no prior privileges, no user interaction, additional attack conditions.
Observed activity
No exploitation observation is recorded.
Known scale
Not quantified.
Evidence confidence basis
Insufficient evidence

Score evaluated: 2026-11-05 14:00:00.097835+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
21 Oct 2026, 16:09
Published
21 Oct 2026, 16:12
Latest press mention
22 Oct 2026, 19:03
Score calculated
05 Nov 2026, 14:00