OPENSUSE-SU-2026:21720-1
Vulnerability from csaf_opensuse - Published: 2026-09-01 14:18 - Updated: 2026-09-17 17:43Summary
Security update for dovecot24
Severity
Critical
Notes
Title of the patch: Security update for dovecot24
Description of the patch: This update for dovecot24 fixes the following issues:
Update to 2.4.5.
- CVE-2026-33263: `submission-login`: panic when `mail_max_userip_connections` is reached (bsc#1276794).
- CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).
- CVE-2026-33604: SMTP smuggling via missing dot-stuffing after bare carriage return (bsc#1276802).
- CVE-2026-33605: `managesieve-login`: pre-auth crash (bsc#1276809).
- CVE-2026-33606: `dsync`: mail content can cause `dsync` protocol injection (bsc#1276800).
- CVE-2026-33607: IMAP `LIST` `match_sub()` exponential backtracking leading to CPU denial of service (bsc#1276795).
- CVE-2026-40013: stack buffer underflow in `pigeonhole` `ManageSieve` `CHECKSCRIPT/PUTSCRIPT` (bsc#1276807).
- CVE-2026-40014: CPU DoS via crafted references header (bsc#1276804).
- CVE-2026-40015: `imap-hibernate` can be crashed (bsc#1276812).
- CVE-2026-40017: CPU DoS via CRC32 hash collision in `strmap` (bsc#1276813).
- CVE-2026-40018: MySQL multi-byte escaping performed incorrectly (bsc#1276810).
- CVE-2026-40203: IMAP compression can reveal whether a small synced email body matches sender-chosen text
(bsc#1276815).
- CVE-2026-40204: `lda_mailbox_autocreate` can bypass ACL restrictions (bsc#1276819).
- CVE-2026-40205: OAuth2 `passdb` scope enforcement bypass via OR semantics in remote validation path (bsc#1276820).
- CVE-2026-42007: `sieve` `editheader` RCE (bsc#1276817).
- CVE-2026-42008: `XCLIENT FORWARD= bare` token not namespaced (bsc#1276824).
- CVE-2026-42391: `imap`: pre-login memory/CPU growth with `ID` command (bsc#1276835).
- CVE-2026-42392: `imap-urlauth` leaks memory into user-visible error messages (bsc#1276829).
- CVE-2026-42393: `doveadm_password` or api key length can be leaked with timing comparisons (bsc#1276827).
- CVE-2026-52687: `imap`: `COMPRESS ZSTD` can cause excessive memory usage (bsc#1276837).
- CVE-2026-42395: single NUL-byte `XCLIENT FORWARD` payload crashes (bsc#1276826).
- CVE-2026-52681: `sieve` resource usage tracking lost when active script changes (bsc#1276828).
- CVE-2026-73208: `auth`: `db-oauth2`: `aud` claim used as fallback for missing scope claim (bsc#1276830).
- CVE-2026-73209: `imap-login` crash due to self-recursion on zero-output decompress chunks (bsc#1276833).
Patchnames: openSUSE-Leap-16.0-1578
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.5 (High)
Affected products
Recommended
32 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-mysql-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-mysql-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-mysql-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-mysql-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-pgsql-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-pgsql-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-pgsql-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-pgsql-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-sqlite-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-sqlite-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-sqlite-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-backend-sqlite-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-devel-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-devel-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-devel-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-devel-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-flatcurve-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-flatcurve-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-flatcurve-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-flatcurve-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-solr-0:2.4.4-160000.2.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-solr-0:2.4.4-160000.2.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-solr-0:2.4.4-160000.2.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:dovecot24-fts-solr-0:2.4.4-160000.2.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
7.5 (High)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
important
4.8 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
6.5 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
6.5 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
7.4 (High)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
important
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
9.1 (Critical)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
critical
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
7.5 (High)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
important
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
4.3 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
6.5 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
7.4 (High)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
important
6.5 (Medium)
Affected products
Recommended
32 products, the same list as for
CVE-2026-27852
Threats
Impact
moderate
References
123 references
{
"document": {
"aggregate_severity": {
"namespace": "https://www.suse.com/support/security/rating/",
"text": "critical"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright 2024 SUSE LLC. All rights reserved.",
"tlp": {
"label": "WHITE",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en",
"notes": [
{
"category": "summary",
"text": "Security update for dovecot24",
"title": "Title of the patch"
},
{
"category": "description",
"text": "This update for dovecot24 fixes the following issues:\n\nUpdate to 2.4.5.\n\n- CVE-2026-33263: `submission-login`: panic when `mail_max_userip_connections` is reached (bsc#1276794).\n- CVE-2026-27852: DoS by sending mail with bad header (bsc#1276799).\n- CVE-2026-33604: SMTP smuggling via missing dot-stuffing after bare carriage return (bsc#1276802).\n- CVE-2026-33605: `managesieve-login`: pre-auth crash (bsc#1276809).\n- CVE-2026-33606: `dsync`: mail content can cause `dsync` protocol injection (bsc#1276800).\n- CVE-2026-33607: IMAP `LIST` `match_sub()` exponential backtracking leading to CPU denial of service (bsc#1276795).\n- CVE-2026-40013: stack buffer underflow in `pigeonhole` `ManageSieve` `CHECKSCRIPT/PUTSCRIPT` (bsc#1276807).\n- CVE-2026-40014: CPU DoS via crafted references header (bsc#1276804).\n- CVE-2026-40015: `imap-hibernate` can be crashed (bsc#1276812).\n- CVE-2026-40017: CPU DoS via CRC32 hash collision in `strmap` (bsc#1276813).\n- CVE-2026-40018: MySQL multi-byte escaping performed incorrectly (bsc#1276810).\n- CVE-2026-40203: IMAP compression can reveal whether a small synced email body matches sender-chosen text\n (bsc#1276815).\n- CVE-2026-40204: `lda_mailbox_autocreate` can bypass ACL restrictions (bsc#1276819).\n- CVE-2026-40205: OAuth2 `passdb` scope enforcement bypass via OR semantics in remote validation path (bsc#1276820).\n- CVE-2026-42007: `sieve` `editheader` RCE (bsc#1276817).\n- CVE-2026-42008: `XCLIENT FORWARD= bare` token not namespaced (bsc#1276824).\n- CVE-2026-42391: `imap`: pre-login memory/CPU growth with `ID` command (bsc#1276835).\n- CVE-2026-42392: `imap-urlauth` leaks memory into user-visible error messages (bsc#1276829).\n- CVE-2026-42393: `doveadm_password` or api key length can be leaked with timing comparisons (bsc#1276827).\n- CVE-2026-52687: `imap`: `COMPRESS ZSTD` can cause excessive memory usage (bsc#1276837).\n- CVE-2026-42395: single NUL-byte `XCLIENT FORWARD` payload crashes (bsc#1276826).\n- CVE-2026-52681: `sieve` resource usage tracking lost when active script changes (bsc#1276828).\n- CVE-2026-73208: `auth`: `db-oauth2`: `aud` claim used as fallback for missing scope claim (bsc#1276830).\n- CVE-2026-73209: `imap-login` crash due to self-recursion on zero-output decompress chunks (bsc#1276833).\n",
"title": "Description of the patch"
},
{
"category": "details",
"text": "openSUSE-Leap-16.0-1578",
"title": "Patchnames"
},
{
"category": "legal_disclaimer",
"text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
"title": "Terms of use"
}
],
"publisher": {
"category": "vendor",
"contact_details": "https://www.suse.com/support/security/contact/",
"name": "SUSE Product Security Team",
"namespace": "https://www.suse.com/"
},
"references": [
{
"category": "external",
"summary": "SUSE ratings",
"url": "https://www.suse.com/support/security/rating/"
},
{
"category": "self",
"summary": "URL of this CSAF notice",
"url": "https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_21720-1.json"
},
{
"category": "self",
"summary": "SUSE Bug 1276794",
"url": "https://bugzilla.suse.com/1276794"
},
{
"category": "self",
"summary": "SUSE Bug 1276795",
"url": "https://bugzilla.suse.com/1276795"
},
{
"category": "self",
"summary": "SUSE Bug 1276799",
"url": "https://bugzilla.suse.com/1276799"
},
{
"category": "self",
"summary": "SUSE Bug 1276800",
"url": "https://bugzilla.suse.com/1276800"
},
{
"category": "self",
"summary": "SUSE Bug 1276802",
"url": "https://bugzilla.suse.com/1276802"
},
{
"category": "self",
"summary": "SUSE Bug 1276804",
"url": "https://bugzilla.suse.com/1276804"
},
{
"category": "self",
"summary": "SUSE Bug 1276807",
"url": "https://bugzilla.suse.com/1276807"
},
{
"category": "self",
"summary": "SUSE Bug 1276809",
"url": "https://bugzilla.suse.com/1276809"
},
{
"category": "self",
"summary": "SUSE Bug 1276810",
"url": "https://bugzilla.suse.com/1276810"
},
{
"category": "self",
"summary": "SUSE Bug 1276812",
"url": "https://bugzilla.suse.com/1276812"
},
{
"category": "self",
"summary": "SUSE Bug 1276813",
"url": "https://bugzilla.suse.com/1276813"
},
{
"category": "self",
"summary": "SUSE Bug 1276815",
"url": "https://bugzilla.suse.com/1276815"
},
{
"category": "self",
"summary": "SUSE Bug 1276817",
"url": "https://bugzilla.suse.com/1276817"
},
{
"category": "self",
"summary": "SUSE Bug 1276819",
"url": "https://bugzilla.suse.com/1276819"
},
{
"category": "self",
"summary": "SUSE Bug 1276820",
"url": "https://bugzilla.suse.com/1276820"
},
{
"category": "self",
"summary": "SUSE Bug 1276824",
"url": "https://bugzilla.suse.com/1276824"
},
{
"category": "self",
"summary": "SUSE Bug 1276826",
"url": "https://bugzilla.suse.com/1276826"
},
{
"category": "self",
"summary": "SUSE Bug 1276827",
"url": "https://bugzilla.suse.com/1276827"
},
{
"category": "self",
"summary": "SUSE Bug 1276828",
"url": "https://bugzilla.suse.com/1276828"
},
{
"category": "self",
"summary": "SUSE Bug 1276829",
"url": "https://bugzilla.suse.com/1276829"
},
{
"category": "self",
"summary": "SUSE Bug 1276830",
"url": "https://bugzilla.suse.com/1276830"
},
{
"category": "self",
"summary": "SUSE Bug 1276833",
"url": "https://bugzilla.suse.com/1276833"
},
{
"category": "self",
"summary": "SUSE Bug 1276835",
"url": "https://bugzilla.suse.com/1276835"
},
{
"category": "self",
"summary": "SUSE Bug 1276837",
"url": "https://bugzilla.suse.com/1276837"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-27852 page",
"url": "https://www.suse.com/security/cve/CVE-2026-27852/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-33263 page",
"url": "https://www.suse.com/security/cve/CVE-2026-33263/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-33604 page",
"url": "https://www.suse.com/security/cve/CVE-2026-33604/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-33605 page",
"url": "https://www.suse.com/security/cve/CVE-2026-33605/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-33606 page",
"url": "https://www.suse.com/security/cve/CVE-2026-33606/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-33607 page",
"url": "https://www.suse.com/security/cve/CVE-2026-33607/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40013 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40013/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40014 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40014/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40015 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40015/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40017 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40017/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40018 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40018/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40203 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40203/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40204 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40204/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-40205 page",
"url": "https://www.suse.com/security/cve/CVE-2026-40205/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-42007 page",
"url": "https://www.suse.com/security/cve/CVE-2026-42007/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-42008 page",
"url": "https://www.suse.com/security/cve/CVE-2026-42008/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-42391 page",
"url": "https://www.suse.com/security/cve/CVE-2026-42391/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-42392 page",
"url": "https://www.suse.com/security/cve/CVE-2026-42392/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-42393 page",
"url": "https://www.suse.com/security/cve/CVE-2026-42393/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-42395 page",
"url": "https://www.suse.com/security/cve/CVE-2026-42395/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-52681 page",
"url": "https://www.suse.com/security/cve/CVE-2026-52681/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-52687 page",
"url": "https://www.suse.com/security/cve/CVE-2026-52687/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-73208 page",
"url": "https://www.suse.com/security/cve/CVE-2026-73208/"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2026-73209 page",
"url": "https://www.suse.com/security/cve/CVE-2026-73209/"
}
],
"title": "Security update for dovecot24",
"tracking": {
"current_release_date": "2026-09-17T17:43:13Z",
"generator": {
"date": "2026-09-01T14:18:02Z",
"engine": {
"name": "cve-database.git:bin/generate-csaf.pl",
"version": "1"
}
},
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}
],
"threats": [
{
"category": "impact",
"date": "2026-09-01T14:18:02Z",
"details": "moderate"
}
],
"title": "CVE-2026-73209"
}
]
}
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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.
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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.
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