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    22 vulnerabilities found for c-ares by c-ares

    CVE-2025-62408 (GCVE-0-2025-62408)

    Vulnerability from nvd – Published: 2025-12-08 22:04 – Updated: 2025-12-09 16:05
    VLAI
    Title
    c-ares has a Use After Free vulnerability when connection is cleaned up after error
    Summary
    c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using read_answer() and process_answer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: > 1.32.3, < 1.34.6
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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        "title": "CISA ADP Vulnrichment"
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    CVE-2025-31498 (GCVE-0-2025-31498)

    Vulnerability from nvd – Published: 2025-04-08 13:53 – Updated: 2025-04-08 18:40
    VLAI
    Title
    c-ares has a use-after-free in read_answers()
    Summary
    c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in read_answers() when process_answer() may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed the connection immediately after a response. If there was an issue trying to put that new transaction on the wire, it would close the connection handle, but read_answers() was still expecting the connection handle to be available to possibly dequeue other responses. In theory a remote attacker might be able to trigger this by flooding the target with ICMP UNREACHABLE packets if they also control the upstream nameserver and can return a result with one of those conditions, this has been untested. Otherwise only a local attacker might be able to change system behavior to make send()/write() return a failure condition. This vulnerability is fixed in 1.34.5.
    Severity
    8.3 (High)
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: >= 1.32.3, < 1.34.5
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2024-25629 (GCVE-0-2024-25629)

    Vulnerability from nvd – Published: 2024-02-23 14:52 – Updated: 2025-02-13 17:40
    VLAI
    Title
    c-ares out of bounds read in ares__read_line()
    Summary
    c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIASES` file, and if using a c-ares version prior to 1.27.0, the `/etc/hosts` file. If any of these configuration files has an embedded `NULL` character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist.
    Severity
    4.4 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.27.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2020-22217 (GCVE-0-2020-22217)

    Vulnerability from nvd – Published: 2023-08-22 00:00 – Updated: 2024-10-03 19:59
    VLAI
    Summary
    Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.
    Severity
    No CVSS data available.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • n/a
    Assigner
    References
    Show details on NVD website
    To clipboard 

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    CVE-2023-32067 (GCVE-0-2023-32067)

    Vulnerability from nvd – Published: 2023-05-25 22:49 – Updated: 2025-02-13 16:50
    VLAI
    Title
    0-byte UDP payload DoS in c-ares
    Summary
    c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    fedoraproject fedora Affected: 37
        cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
    		 Create a notification for this product.
    c-ares c-ares Affected: 0 , < 1.19.1 (custom)
        cpe:2.3:a:c-ares:c-ares:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    fedoraproject fedora Affected: 38
        cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
    		 Create a notification for this product.
    debian debian_linux Affected: 10.0
    Affected: 11.0
        cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
        cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    		 Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-31147 (GCVE-0-2023-31147)

    Vulnerability from nvd – Published: 2023-05-25 21:55 – Updated: 2025-02-13 16:49
    VLAI
    Title
    Insufficient randomness in generation of DNS query IDs in c-ares
    Summary
    c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-330 - Use of Insufficiently Random Values
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-31130 (GCVE-0-2023-31130)

    Vulnerability from nvd – Published: 2023-05-25 21:45 – Updated: 2025-02-13 16:49
    VLAI
    Title
    Buffer Underwrite in ares_inet_net_pton()
    Summary
    c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.
    Severity
    4.1 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-124 - Buffer Underwrite ('Buffer Underflow')
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-31124 (GCVE-0-2023-31124)

    Vulnerability from nvd – Published: 2023-05-25 21:09 – Updated: 2025-02-13 16:49
    VLAI
    Title
    AutoTools does not set CARES_RANDOM_FILE during cross compilation
    Summary
    c-ares is an asynchronous resolver library. When cross-compiling c-ares and using the autotools build system, CARES_RANDOM_FILE will not be set, as seen when cross compiling aarch64 android. This will downgrade to using rand() as a fallback which could allow an attacker to take advantage of the lack of entropy by not using a CSPRNG. This issue was patched in version 1.19.1.
    Severity
    3.7 (Low)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-330 - Use of Insufficiently Random Values
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2020-14354 (GCVE-0-2020-14354)

    Vulnerability from nvd – Published: 2021-05-13 13:38 – Updated: 2024-08-04 12:39
    VLAI
    Summary
    A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to ares_getaddrinfo() completing. This flaw possibly allows an attacker to crash the service that uses c-ares lib. The highest threat from this vulnerability is to this service availability.
    Severity
    No CVSS data available.
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    n/a c-ares Affected: c-ares 1.16.1
    Show details on NVD website
    To clipboard 

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    CVE-2017-1000381 (GCVE-0-2017-1000381)

    Vulnerability from nvd – Published: 2017-07-07 17:00 – Updated: 2024-08-05 22:00
    VLAI
    Summary
    The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered to read memory outside of the given input buffer if the passed in DNS response packet was crafted in a particular way.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    URL Tags
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    http://www.securityfocus.com/bid/99148 vdb-entryx_refsource_BID
    https://c-ares.haxx.se/adv_20170620.html x_refsource_CONFIRM
    Date Public
    2017-06-20 00:00
    Show details on NVD website
    To clipboard 

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    CVE-2016-5180 (GCVE-0-2016-5180)

    Vulnerability from nvd – Published: 2016-10-03 15:00 – Updated: 2024-08-06 00:53
    VLAI
    Summary
    Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attackers to cause a denial of service (out-of-bounds write) or possibly execute arbitrary code via a hostname with an escaped trailing dot.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Date Public
    2016-09-29 00:00
    Show details on NVD website
    To clipboard 

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    CVE-2025-62408 (GCVE-0-2025-62408)

    Vulnerability from cvelistv5 – Published: 2025-12-08 22:04 – Updated: 2025-12-09 16:05
    VLAI
    Title
    c-ares has a Use After Free vulnerability when connection is cleaned up after error
    Summary
    c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts when using read_answer() and process_answer(), which can cause a Denial of Service. This issue is fixed in version 1.34.6.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: > 1.32.3, < 1.34.6
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2025-31498 (GCVE-0-2025-31498)

    Vulnerability from cvelistv5 – Published: 2025-04-08 13:53 – Updated: 2025-04-08 18:40
    VLAI
    Title
    c-ares has a use-after-free in read_answers()
    Summary
    c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in read_answers() when process_answer() may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed the connection immediately after a response. If there was an issue trying to put that new transaction on the wire, it would close the connection handle, but read_answers() was still expecting the connection handle to be available to possibly dequeue other responses. In theory a remote attacker might be able to trigger this by flooding the target with ICMP UNREACHABLE packets if they also control the upstream nameserver and can return a result with one of those conditions, this has been untested. Otherwise only a local attacker might be able to change system behavior to make send()/write() return a failure condition. This vulnerability is fixed in 1.34.5.
    Severity
    8.3 (High)
    CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: >= 1.32.3, < 1.34.5
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2024-25629 (GCVE-0-2024-25629)

    Vulnerability from cvelistv5 – Published: 2024-02-23 14:52 – Updated: 2025-02-13 17:40
    VLAI
    Title
    c-ares out of bounds read in ares__read_line()
    Summary
    c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIASES` file, and if using a c-ares version prior to 1.27.0, the `/etc/hosts` file. If any of these configuration files has an embedded `NULL` character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist.
    Severity
    4.4 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.27.0
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2020-22217 (GCVE-0-2020-22217)

    Vulnerability from cvelistv5 – Published: 2023-08-22 00:00 – Updated: 2024-10-03 19:59
    VLAI
    Summary
    Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.
    Severity
    No CVSS data available.
    SSVC
    Exploitation: poc Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • n/a
    Assigner
    References
    Show details on NVD website
    To clipboard 

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    CVE-2023-32067 (GCVE-0-2023-32067)

    Vulnerability from cvelistv5 – Published: 2023-05-25 22:49 – Updated: 2025-02-13 16:50
    VLAI
    Title
    0-byte UDP payload DoS in c-ares
    Summary
    c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-400 - Uncontrolled Resource Consumption
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    fedoraproject fedora Affected: 37
        cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
    		 Create a notification for this product.
    c-ares c-ares Affected: 0 , < 1.19.1 (custom)
        cpe:2.3:a:c-ares:c-ares:*:*:*:*:*:*:*:*
    		 Create a notification for this product.
    fedoraproject fedora Affected: 38
        cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
    		 Create a notification for this product.
    debian debian_linux Affected: 10.0
    Affected: 11.0
        cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
        cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    		 Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-31147 (GCVE-0-2023-31147)

    Vulnerability from cvelistv5 – Published: 2023-05-25 21:55 – Updated: 2025-02-13 16:49
    VLAI
    Title
    Insufficient randomness in generation of DNS query IDs in c-ares
    Summary
    c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-330 - Use of Insufficiently Random Values
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-31130 (GCVE-0-2023-31130)

    Vulnerability from cvelistv5 – Published: 2023-05-25 21:45 – Updated: 2025-02-13 16:49
    VLAI
    Title
    Buffer Underwrite in ares_inet_net_pton()
    Summary
    c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.
    Severity
    4.1 (Medium)
    CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-124 - Buffer Underwrite ('Buffer Underflow')
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2023-31124 (GCVE-0-2023-31124)

    Vulnerability from cvelistv5 – Published: 2023-05-25 21:09 – Updated: 2025-02-13 16:49
    VLAI
    Title
    AutoTools does not set CARES_RANDOM_FILE during cross compilation
    Summary
    c-ares is an asynchronous resolver library. When cross-compiling c-ares and using the autotools build system, CARES_RANDOM_FILE will not be set, as seen when cross compiling aarch64 android. This will downgrade to using rand() as a fallback which could allow an attacker to take advantage of the lack of entropy by not using a CSPRNG. This issue was patched in version 1.19.1.
    Severity
    3.7 (Low)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-330 - Use of Insufficiently Random Values
    Assigner
    References
    Impacted products
    Vendor Product Version
    c-ares c-ares Affected: < 1.19.1
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2020-14354 (GCVE-0-2020-14354)

    Vulnerability from cvelistv5 – Published: 2021-05-13 13:38 – Updated: 2024-08-04 12:39
    VLAI
    Summary
    A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to ares_getaddrinfo() completing. This flaw possibly allows an attacker to crash the service that uses c-ares lib. The highest threat from this vulnerability is to this service availability.
    Severity
    No CVSS data available.
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    n/a c-ares Affected: c-ares 1.16.1
    Show details on NVD website
    To clipboard 

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    CVE-2017-1000381 (GCVE-0-2017-1000381)

    Vulnerability from cvelistv5 – Published: 2017-07-07 17:00 – Updated: 2024-08-05 22:00
    VLAI
    Summary
    The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered to read memory outside of the given input buffer if the passed in DNS response packet was crafted in a particular way.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    URL Tags
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    Date Public
    2017-06-20 00:00
    Show details on NVD website
    To clipboard 

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    CVE-2016-5180 (GCVE-0-2016-5180)

    Vulnerability from cvelistv5 – Published: 2016-10-03 15:00 – Updated: 2024-08-06 00:53
    VLAI
    Summary
    Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attackers to cause a denial of service (out-of-bounds write) or possibly execute arbitrary code via a hostname with an escaped trailing dot.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Date Public
    2016-09-29 00:00
    Show details on NVD website
    To clipboard 

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