CURL-CVE-2021-22925

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Source
https://curl.se/docs/CVE-2021-22925.html
Import Source
https://curl.se/docs/CURL-CVE-2021-22925.json
JSON Data
https://api.osv.dev/v1/vulns/CURL-CVE-2021-22925
Aliases
Published
2021-07-21T08:00:00Z
Modified
2026-05-27T02:29:25.274707Z
Summary
TELNET stack contents disclosure again
Details

curl supports the -t command line option, known as CURLOPT_TELNETOPTIONS in libcurl. This rarely used option is used to send variable=content pairs to TELNET servers.

Due to flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server. Therefore potentially revealing sensitive internal information to the server using a clear-text network protocol.

This could happen because curl did not call and use sscanf() correctly when parsing the string provided by the application.

The previous curl security vulnerability CVE-2021-22898 is almost identical to this one but the fix was insufficient so this security vulnerability remained.

Database specific 
{
    "issue": "https://hackerone.com/reports/1223882",
    "last_affected": "7.77.0",
    "CWE": {
        "desc": "Use of Uninitialized Variable",
        "id": "CWE-457"
    },
    "URL": "https://curl.se/docs/CVE-2021-22925.json",
    "affects": "both",
    "package": "curl",
    "award": {
        "currency": "USD",
        "amount": "800"
    },
    "www": "https://curl.se/docs/CVE-2021-22925.html",
    "severity": "Medium"
}
References
Credits
    • Red Hat Product Security - FINDER
    • Red Hat Product Security - REMEDIATION_DEVELOPER

Affected packages

Git / github.com/curl/curl.git

Affected ranges

Type
SEMVER
Events
Introduced
7.7
Fixed
7.78.0
Type
GIT
Repo
https://github.com/curl/curl.git
Events
Introduced
a1d6ad26100bc493c7b04f1301b1634b7f5aa8b4
Fixed
894f6ec730597eb243618d33cc84d71add8d6a8a

Affected versions

7.*
7.10
7.10.1
7.10.2
7.10.3
7.10.4
7.10.5
7.10.6
7.10.7
7.10.8
7.11.0
7.11.1
7.11.2
7.12.0
7.12.1
7.12.2
7.12.3
7.13.0
7.13.1
7.13.2
7.14.0
7.14.1
7.15.0
7.15.1
7.15.2
7.15.3
7.15.4
7.15.5
7.16.0
7.16.1
7.16.2
7.16.3
7.16.4
7.17.0
7.17.1
7.18.0
7.18.1
7.18.2
7.19.0
7.19.1
7.19.2
7.19.3
7.19.4
7.19.5
7.19.6
7.19.7
7.20.0
7.20.1
7.21.0
7.21.1
7.21.2
7.21.3
7.21.4
7.21.5
7.21.6
7.21.7
7.22.0
7.23.0
7.23.1
7.24.0
7.25.0
7.26.0
7.27.0
7.28.0
7.28.1
7.29.0
7.30.0
7.31.0
7.32.0
7.33.0
7.34.0
7.35.0
7.36.0
7.37.0
7.37.1
7.38.0
7.39.0
7.40.0
7.41.0
7.42.0
7.42.1
7.43.0
7.44.0
7.45.0
7.46.0
7.47.0
7.47.1
7.48.0
7.49.0
7.49.1
7.50.0
7.50.1
7.50.2
7.50.3
7.51.0
7.52.0
7.52.1
7.53.0
7.53.1
7.54.0
7.54.1
7.55.0
7.55.1
7.56.0
7.56.1
7.57.0
7.58.0
7.59.0
7.60.0
7.61.0
7.61.1
7.62.0
7.63.0
7.64.0
7.64.1
7.65.0
7.65.1
7.65.2
7.65.3
7.66.0
7.67.0
7.68.0
7.69.0
7.69.1
7.7
7.7.1
7.7.2
7.7.3
7.70.0
7.71.0
7.71.1
7.72.0
7.73.0
7.74.0
7.75.0
7.76.0
7.76.1
7.77.0
7.8
7.8.1
7.9
7.9.1
7.9.2
7.9.3
7.9.4
7.9.5
7.9.6
7.9.7
7.9.8
Other
before_ftp_statemachine
before_urldata_rename
curl-7_10
curl-7_10_1
curl-7_10_2
curl-7_10_3
curl-7_10_4
curl-7_10_5
curl-7_10_6
curl-7_10_7
curl-7_10_8
curl-7_11_0
curl-7_11_1
curl-7_11_2
curl-7_12_0
curl-7_12_1
curl-7_12_2
curl-7_12_3
curl-7_13_0
curl-7_13_1
curl-7_13_2
curl-7_14_0
curl-7_14_1
curl-7_15_0
curl-7_15_1
curl-7_15_2
curl-7_15_3
curl-7_15_4
curl-7_15_5
curl-7_15_6-prepipeline
curl-7_16_0
curl-7_16_1
curl-7_16_2
curl-7_16_3
curl-7_16_4
curl-7_17_0
curl-7_17_0-preldapfix
curl-7_17_1
curl-7_18_0
curl-7_18_1
curl-7_18_2
curl-7_19_0
curl-7_19_1
curl-7_19_2
curl-7_19_3
curl-7_19_4
curl-7_19_5
curl-7_19_6
curl-7_19_7
curl-7_20_0
curl-7_20_1
curl-7_21_0
curl-7_21_1
curl-7_21_2
curl-7_21_3
curl-7_21_4
curl-7_21_5
curl-7_21_6
curl-7_21_7
curl-7_22_0
curl-7_23_0
curl-7_23_1
curl-7_24_0
curl-7_25_0
curl-7_26_0
curl-7_27_0
curl-7_28_0
curl-7_28_1
curl-7_29_0
curl-7_30_0
curl-7_31_0
curl-7_32_0
curl-7_33_0
curl-7_34_0
curl-7_35_0
curl-7_36_0
curl-7_37_0
curl-7_37_1
curl-7_38_0
curl-7_39_0
curl-7_40_0
curl-7_41_0
curl-7_42_0
curl-7_42_1
curl-7_43_0
curl-7_44_0
curl-7_45_0
curl-7_46_0
curl-7_47_0
curl-7_47_1
curl-7_48_0
curl-7_49_0
curl-7_49_1
curl-7_50_0
curl-7_50_1
curl-7_50_2
curl-7_50_3
curl-7_51_0
curl-7_52_0
curl-7_52_1
curl-7_53_0
curl-7_53_1
curl-7_54_0
curl-7_54_1
curl-7_55_0
curl-7_55_1
curl-7_56_0
curl-7_56_1
curl-7_57_0
curl-7_58_0
curl-7_59_0
curl-7_60_0
curl-7_61_0
curl-7_61_1
curl-7_62_0
curl-7_63_0
curl-7_64_0
curl-7_64_1
curl-7_65_0
curl-7_65_1
curl-7_65_2
curl-7_65_3
curl-7_66_0
curl-7_67_0
curl-7_68_0
curl-7_69_0
curl-7_69_1
curl-7_7
curl-7_7-beta1
curl-7_7-beta2
curl-7_7-beta3
curl-7_7-beta5
curl-7_70_0
curl-7_71_0
curl-7_71_1
curl-7_72_0
curl-7_73_0
curl-7_74_0
curl-7_75_0
curl-7_76_0
curl-7_76_1
curl-7_77_0
curl-7_7_1
curl-7_7_2
curl-7_7_3
curl-7_7_alpha2
curl-7_8
curl-7_8-pre2
curl-7_8_1
curl-7_8_1-pre3
curl-7_9
curl-7_9_1
curl-7_9_2
curl-7_9_3
curl-7_9_3-pre1
curl-7_9_3-pre2
curl-7_9_3-pre3
curl-7_9_4
curl-7_9_5
curl-7_9_5-pre2
curl-7_9_5-pre4
curl-7_9_6
curl-7_9_7
curl-7_9_7-pre2
curl-7_9_8
tiny-curl-7_72_0

Database specific

vanir_signatures 
[
    {
        "signature_type": "Function",
        "id": "CURL-CVE-2021-22925-42b460d0",
        "deprecated": false,
        "digest": {
            "length": 2162.0,
            "function_hash": "316933520917559347077501990993139660214"
        },
        "signature_version": "v1",
        "target": {
            "function": "suboption",
            "file": "lib/telnet.c"
        },
        "source": "https://github.com/curl/curl.git/commit/894f6ec730597eb243618d33cc84d71add8d6a8a"
    },
    {
        "signature_type": "Line",
        "id": "CURL-CVE-2021-22925-6cb4958a",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "73371219997613798860273049430938336872",
                "246464346227486228829190896668526825182",
                "211103125117598029027713563117906999281",
                "45302255415263079241276111190376578806",
                "66444213479799562148186156236093836400",
                "171170274092991383111325095799231300614",
                "269634034906769680142597048279449049406",
                "89712093938542999602004345946193224210",
                "263138597271543149838825752148738172629"
            ]
        },
        "signature_version": "v1",
        "target": {
            "file": "lib/telnet.c"
        },
        "source": "https://github.com/curl/curl.git/commit/894f6ec730597eb243618d33cc84d71add8d6a8a"
    }
]
source 
"https://curl.se/docs/CURL-CVE-2021-22925.json"
vanir_signatures_modified 
"2026-05-27T02:29:25Z"