CVE-2009-3555

Read full description

The TLS protocol, and the SSL protocol 3.0 and possibly earlier, as used in Microsoft Internet Information Services (IIS) 7.0, mod_ssl in the Apache HTTP Server 2.2.14 and earlier, OpenSSL before 0.9.8l, GnuTLS 2.8.5 and earlier, Mozilla Network Security Services (NSS) 3.12.4 and earlier, multiple Cisco products, and other products, does not properly associate renegotiation handshakes with an existing connection, which allows man-in-the-middle attackers to insert data into HTTPS sessions, and possibly other types of sessions protected by TLS or SSL, by sending an unauthenticated request that is processed retroactively by a server in a post-renegotiation context, related to a "plaintext injection" attack, aka the "Project Mogul" issue.

CVSS 9.8 (CRITICAL)

Attention and evidence

HYPE SCORE

0.0/10

REALITY · THREAT PRIORITY

6.0/10

General review priority; not probability

Evidence confidence: PoC published; attacks unconfirmed

Why this priority?

Technical severity: CVSS 9.8: +3.43
Fresh EPSS: 87.26%: +2.18
Published PoC; attacks unconfirmed: +0.40

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

Tripwire

Press · 11 Nov 2015, 08:00 · TLS Extended Master Secret Extension: Fixing a Hole in TLS - Tripwire

Score evolution

● Hype ● Reality

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

First record: hype 0.0 · reality 6.0 (2026-11-02 15:11). The curve appears once the score changes.

Public exploit evidence

Public exploit entries / repo candidates

Source entries and unverified repository candidates are counted separately.

Public exploit evidence

exploitdb #10071 2009-11-10
exploitdb #10579 2009-12-21

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.

Evidence in context

Confidence in exploitation evidence: PoC published; attacks unconfirmed
Priority basis: Exploitation in attacks unconfirmed; CVSS 9.8; EPSS 87.3%
Attention, last 30 days: 0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential: network access, no prior privileges, no user interaction.
Observed activity: Public PoC evidence is present.
Known scale: Not quantified.
Evidence confidence basis: Published PoC artifact; functionality unverified

Score evaluated: 2026-11-06 07:51:05.081558+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline

Published

09 Nov 2009, 17:00

First press mention

11 Nov 2015, 08:00

Latest press mention

11 Nov 2015, 08:00

Score calculated

06 Nov 2026, 07:51

PoCs on GitHub

2 repositories