{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2019-1842 in the wild and no public exploit code.","fix":"No fix has been published for CVE-2019-1842 yet. Limit exposure of the affected software until one is available.","what":"CVE-2019-1842 is a medium-severity authentication bypass vulnerability in Cisco IOS XR Software, published on 5 Jun 2019. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2019-1842 and fix it if it is affected.\n\nWhat it is: CVE-2019-1842 is a medium-severity authentication bypass vulnerability in Cisco IOS XR Software, published on 5 Jun 2019. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2019-1842 in the wild and no public exploit code.\n\nAffected product: Cisco IOS XR Software. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2019-1842/ (Markdown: https://insights.sbomify.com/CVE-2019-1842/index.md)","id":"CVE-2019-1842","markdown":"https://insights.sbomify.com/CVE-2019-1842/index.md","name":"CVE-2019-1842","record":{"aliases":["GHSA-v5xq-942q-fwvr"],"analysis":{"component_type":"network_device","fix_type":"patch","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Cisco IOS XR","requires_auth":"low_privilege","summary":"An authenticated remote attacker can bypass command authorization or enumerate users via a logic error in SSH authentication on Cisco IOS XR devices.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"cisco","cpe":[{"product":"ios_xr_firmware","vendor":"cisco"}],"cvss":{"score":5.4,"severity":"medium","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.0"},"cwes":[{"id":"CWE-287","name":"Improper Authentication"},{"id":"CWE-285","name":"Improper Authorization"}],"description":"A vulnerability in the Secure Shell (SSH) authentication function of Cisco IOS XR Software could allow an authenticated, remote attacker to successfully log in to an affected device using two distinct usernames. The vulnerability is due to a logic error that may occur when certain sequences of actions are processed during an SSH login event on the affected device. An attacker could exploit this vulnerability by initiating an SSH session to the device with a specific sequence that presents the two usernames. A successful exploit could result in logging data misrepresentation, user enumeration, or, in certain circumstances, a command authorization bypass. See the Details section for more information.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":null,"headline":"Cisco IOS XR Software Secure Shell Authentication Vulnerability","id":"CVE-2019-1842","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"auth_bypass","year":"2019"},"n_packages":0,"n_references":2,"next":{"headline":"Cisco RV110W, RV130W, and RV215W Routers Management Interface Denial of Service Vulnerability","id":"CVE-2019-1843"},"packages":[],"prev":{"headline":"Cisco DNA Center Unintended Proxy Via SWIM Import Interface Vulnerability","id":"CVE-2019-1841"},"products":["Cisco IOS XR Software"],"published":"2019-06-05","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-11-21","vendors":["Cisco"]},"summary":"An authenticated remote attacker can bypass command authorization or enumerate users via a logic error in SSH authentication on Cisco IOS XR devices.","url":"https://insights.sbomify.com/CVE-2019-1842/"}