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    CVE-2020-1763

    An out-of-bounds buffer read flaw was found in the pluto daemon of libreswan from versions 3.27 till 3.31 where, an unauthenticated attacker could use this flaw to crash libreswan by sending specially-crafted IKEv1 Informational Exchange packets. The daemon respawns after the crash.

    Published:May 11, 2020
    Last Modified:Nov 21, 2024
    EPS:May 12, 2020
    EPSS Score:0.04755
    CVSS Score:7.5

    Affected Products

    Vendor
    Libreswan
    Product
    Libreswan
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Eus

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-14957 (CVSS 7.5) — In FIPS mode, Libreswan's add_decoded_cert() function calls CERT_ExtractPublicKey() and asserts that the resul…
    CVE-2026-50722 (CVSS 8.1) — Libreswan, via the function RSA_authenticate_hash_signature_pkcs1_1_5_rsa(), did not correctly verify the DER …
    CVE-2026-50721 (CVSS 8.1) — Libreswan, via the function RSA_authenticate_hash_signature_raw_rsa(), did not correctly verify the length of …
    CVE-2026-12413 (CVSS 7.5) — An invalidly formatted IKEv2 fragment causes the Libreswan pluto daemon to crash and restart. Continued exploi…
    CVE-2024-3652 (CVSS 6.5) — The Libreswan Project was notified of an issue causing libreswan to restart when using IKEv1 without specifyin…
    CVE-2023-38710 (CVSS 6.5) — An issue was discovered in Libreswan before 4.12. When an IKEv2 Child SA REKEY packet contains an invalid IPse…
    CVE-2023-38711 (CVSS 6.5) — An issue was discovered in Libreswan before 4.12. When an IKEv1 Quick Mode connection configured with ID_IPV4_…
    CVE-2023-38712 (CVSS 6.5) — An issue was discovered in Libreswan 3.x and 4.x before 4.12. When an IKEv1 ISAKMP SA Informational Exchange p…
    CVE-2023-2295 (CVSS 7.5) — A vulnerability was found in the libreswan library. This security issue occurs when an IKEv1 Aggressive Mode p…
    CVE-2023-30570 (CVSS 7.5) — pluto in Libreswan before 4.11 allows a denial of service (responder SPI mishandling and daemon crash) via una…

    References

    https://bugzilla.redhat.com/show_bug.cgi?id=1813329
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763
    https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
    https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8
    https://libreswan.org/security/CVE-2020-1763/CVE-2020-1763.txt
    https://security.gentoo.org/glsa/202007-21
    https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04
    https://www.debian.org/security/2020/dsa-4684
    https://bugzilla.redhat.com/show_bug.cgi?id=1813329
    https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1763
    https://cert-portal.siemens.com/productcert/pdf/ssa-379803.pdf
    https://github.com/libreswan/libreswan/commit/471a3e41a449d7c753bc4edbba4239501bb62ba8
    https://libreswan.org/security/CVE-2020-1763/CVE-2020-1763.txt
    https://security.gentoo.org/glsa/202007-21
    https://us-cert.cisa.gov/ics/advisories/icsa-21-040-04
    https://www.debian.org/security/2020/dsa-4684

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High