CVE-2017-2669

Dovecot before version 2.2.29 is vulnerable to a denial of service. When 'dict' passdb and userdb were used for user authentication, the username sent by the IMAP/POP3 client was sent through var_expand() to perform %variable expansion. Sending specially crafted %variable fields could result in excessive memory usage causing the process to crash (and restart), or excessive CPU usage causing all authentications to hang.

Database specific

{
    "unresolved_ranges":  [
        {
            "cpes":  [
                "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
            ],
            "extracted_events":  [
                {
                    "introduced":  "8.0"
                },
                {
                    "last_affected":  "8.0"
                }
            ],
            "source":  "CPE_STRING",
            "vendor_product":  "debian:debian_linux"
        }
    ]
}

References

Affected packages

Git / github.com/dovecot/core

Affected ranges

Type

GIT

Repo

https://github.com/dovecot/core

Events

Introduced

54d654098032d96975b70749b505fae538e97f7a

Last Affected

bed84341d457ca12b3ffc2789f5ce5a50f473c17

Fixed

000030feb7a30f193197f1aab8a7b04a26b42735

Database specific

Show details

{
    "cpe":  "cpe:2.3:a:dovecot:dovecot:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "2.2.26"
        },
        {
            "last_affected":  "2.2.28"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2017-2669.json"

vanir_signatures

[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "267636158964568098863636960298466532724",
                "2352569610556384996954443346264017109",
                "93946251500024901057239984742115296506",
                "24637658557778190796647398033891828969",
                "211611469493583939446357562940970616992",
                "278277978705547623851111021639629407269",
                "124382171383543376698073773677944138094",
                "187087530198002650493950430766339868348",
                "162450648597069746051999601511029220517"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2017-2669-8b3a137b",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735",
        "target":  {
            "file":  "src/auth/db-dict.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "258390715530272175125914701927623207390",
            "length":  1242
        },
        "id":  "CVE-2017-2669-a636a152",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/dovecot/core/commit/000030feb7a30f193197f1aab8a7b04a26b42735",
        "target":  {
            "file":  "src/auth/db-dict.c",
            "function":  "db_dict_iter_lookup_key_values"
        }
    }
]

vanir_signatures_modified

"2026-07-08T15:11:12Z"