UBUNTU-CVE-2026-55953 (CVE-2026-55953)
Vulnerability from osv_ubuntu – Published: 2026-07-27 16:17 – Updated: 2026-09-28 20:31 – Source website
VLAI
Details
The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not affected. An on-path attacker between the client and the intended server can respond with a ServerHello selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never offered. Anonymous suites do not require the server to present a certificate, so the entire verify_peer and cacerts configuration is bypassed: the attacker completes the handshake with its own ephemeral parameters, no certificate is validated, no hostname is checked, and ssl:connect returns {ok, Socket}. All subsequent application traffic is readable and modifiable by the attacker. This issue affects OTP from OTP 17.0 before OTP 27.3.4.15, from OTP 28.0 before OTP 28.5.0.4, and from OTP 29.0 before OTP 29.0.4, corresponding to ssl from 5.3.4 before 11.2.12.11, from 11.3 before 11.6.0.4, and from 11.7 before 11.7.4. Whether OTP before OTP 17.0, corresponding to ssl before 5.3.4, is affected is unknown.
Severity
7.4 (High)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"binaries": [
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{
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{
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{
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{
"binary_name": "erlang-common-test",
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{
"binary_name": "erlang-corba",
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{
"binary_name": "erlang-crypto",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"binary_name": "erlang-ic-java",
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{
"binary_name": "erlang-inets",
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{
"binary_name": "erlang-jinterface",
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{
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{
"binary_name": "erlang-megaco",
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{
"binary_name": "erlang-mnesia",
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{
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{
"binary_name": "erlang-nox",
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{
"binary_name": "erlang-observer",
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{
"binary_name": "erlang-odbc",
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{
"binary_name": "erlang-os-mon",
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{
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{
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{
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{
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{
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{
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{
"binary_name": "erlang-snmp",
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{
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{
"binary_name": "erlang-ssh",
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{
"binary_name": "erlang-ssl",
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{
"binary_name": "erlang-syntax-tools",
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{
"binary_name": "erlang-test-server",
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{
"binary_name": "erlang-toolbar",
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{
"binary_name": "erlang-tools",
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{
"binary_name": "erlang-tv",
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{
"binary_name": "erlang-typer",
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{
"binary_name": "erlang-webtool",
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{
"binary_name": "erlang-x11",
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{
"binary_name": "erlang-xmerl",
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{
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}
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}
],
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"1:16.b.2-dfsg-1ubuntu1",
"1:16.b.2-dfsg-2ubuntu1",
"1:16.b.3-dfsg-1ubuntu1",
"1:16.b.3-dfsg-1ubuntu2",
"1:16.b.3-dfsg-1ubuntu2.1",
"1:16.b.3-dfsg-1ubuntu2.2",
"1:16.b.3-dfsg-1ubuntu2.2+esm1"
]
},
{
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{
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{
"binary_name": "erlang-asn1",
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{
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{
"binary_name": "erlang-base-hipe",
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{
"binary_name": "erlang-common-test",
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{
"binary_name": "erlang-corba",
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{
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{
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{
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{
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{
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{
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{
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{
"binary_name": "erlang-ic-java",
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{
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{
"binary_name": "erlang-megaco",
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{
"binary_name": "erlang-mnesia",
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{
"binary_name": "erlang-mode",
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{
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{
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{
"binary_name": "erlang-odbc",
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{
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{
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{
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{
"binary_name": "erlang-src",
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{
"binary_name": "erlang-ssh",
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{
"binary_name": "erlang-ssl",
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{
"binary_name": "erlang-syntax-tools",
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{
"binary_name": "erlang-test-server",
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{
"binary_name": "erlang-tools",
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{
"binary_name": "erlang-typer",
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{
"binary_name": "erlang-webtool",
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{
"binary_name": "erlang-wx",
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{
"binary_name": "erlang-x11",
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{
"binary_name": "erlang-xmerl",
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"1:18.0-dfsg-1ubuntu2",
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"1:18.3-dfsg-1ubuntu2",
"1:18.3-dfsg-1ubuntu3",
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]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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{
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{
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{
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{
"binary_name": "erlang-crypto",
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{
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{
"binary_name": "erlang-dialyzer",
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{
"binary_name": "erlang-diameter",
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{
"binary_name": "erlang-edoc",
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{
"binary_name": "erlang-eldap",
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{
"binary_name": "erlang-erl-docgen",
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{
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{
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{
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{
"binary_name": "erlang-inets",
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{
"binary_name": "erlang-jinterface",
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{
"binary_name": "erlang-manpages",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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},
{
"binary_name": "erlang-reltool",
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},
{
"binary_name": "erlang-runtime-tools",
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},
{
"binary_name": "erlang-snmp",
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},
{
"binary_name": "erlang-src",
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},
{
"binary_name": "erlang-ssh",
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},
{
"binary_name": "erlang-ssl",
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},
{
"binary_name": "erlang-syntax-tools",
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{
"binary_name": "erlang-tools",
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{
"binary_name": "erlang-wx",
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{
"binary_name": "erlang-x11",
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{
"binary_name": "erlang-xmerl",
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{
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}
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"type": "ECOSYSTEM"
}
],
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},
{
"binary_name": "erlang-mode",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-nox",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-observer",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-odbc",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-os-mon",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-parsetools",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-public-key",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-reltool",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-runtime-tools",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-snmp",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-src",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-ssh",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-ssl",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-syntax-tools",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-tftp",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-tools",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-wx",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-x11",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
},
{
"binary_name": "erlang-xmerl",
"binary_version": "1:27.3.4.6+dfsg-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "erlang",
"purl": "pkg:deb/ubuntu/erlang@1:27.3.4.6+dfsg-1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:27.3.4.6+dfsg-1ubuntu0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:27.3.4.1+dfsg-1build1",
"1:27.3.4.3+dfsg-1",
"1:27.3.4.4+dfsg-1",
"1:27.3.4.6+dfsg-1"
]
}
],
"aliases": [],
"details": "The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not affected. An on-path attacker between the client and the intended server can respond with a ServerHello selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never offered. Anonymous suites do not require the server to present a certificate, so the entire verify_peer and cacerts configuration is bypassed: the attacker completes the handshake with its own ephemeral parameters, no certificate is validated, no hostname is checked, and ssl:connect returns {ok, Socket}. All subsequent application traffic is readable and modifiable by the attacker. This issue affects OTP from OTP\u00a017.0 before OTP\u00a027.3.4.15, from OTP\u00a028.0 before OTP\u00a028.5.0.4, and from OTP\u00a029.0 before OTP\u00a029.0.4, corresponding to ssl from 5.3.4 before 11.2.12.11, from 11.3 before 11.6.0.4, and from 11.7 before 11.7.4. Whether OTP before OTP\u00a017.0, corresponding to ssl before 5.3.4, is affected is unknown.",
"id": "UBUNTU-CVE-2026-55953",
"modified": "2026-09-28T20:31:10Z",
"published": "2026-07-27T16:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-55953"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-55953"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8827-1"
}
],
"related": [
"USN-8827-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-55953"
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.