Page generated: 07 Nov 2026, 13:37 UTC
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CVE-2026-121969

netrek-client-cow through 3.3.3 contains a stack-based buffer overflow vulnerability in handleSMessage() in short.c that allows malicious servers to overflow a 100-byte stack buffer by sending oversized SP_S_MESSAGE packets. A malicious Netrek server or man-in-the-middle on the p…

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netrek-client-cow through 3.3.3 contains a stack-based buffer overflow vulnerability in handleSMessage() in short.c that allows malicious servers to overflow a 100-byte stack buffer by sending oversized SP_S_MESSAGE packets. A malicious Netrek server or man-in-the-middle on the plaintext TCP connection can send overlong or unterminated message bodies to write server-controlled bytes onto the stack and crash the client.
CVSS 6.5 (MEDIUM)

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
2.3/10
General review priority; not probability

Evidence confidence: Insufficient evidence

Why this priority?
  • Technical severity: CVSS 6.5: +2.27
  • Fresh EPSS: 0.34%: +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: 1 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Latest Vulnerabilities
Technical advisory · 04 Nov 2026, 20:36 · CVE-2026-121969 - netrek-client-cow through 3.3.3 Stack Buffer Overflow via handleSMessage

Score evolution

● Hype   ● Reality

0.00.51.01.52.02.504 Nov 2026 · INSUFFICIENT DATAHype 0.0Reality 2.305 Nov 2026 · BELOW THRESHOLDSHype 0.0Reality 2.3Nov 4Nov 5

━ Hype Score (Perceived)  ━ Reality threat priority. Definition changes are not new attacks.

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 2 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 6.5; EPSS 0.3%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction.
Observed activity
No exploitation observation is recorded.
Known scale
Not quantified.
Evidence confidence basis
Insufficient evidence

Score evaluated: 2026-11-05 13:59:56.876805+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
04 Nov 2026, 20:36
Score calculated
05 Nov 2026, 13:59