{"vulnerability": "cve-2021-27137", "sightings": [{"uuid": "45c23242-7294-4a36-9621-6b4a81a564a3", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/shortinfo.bsky.social/post/3ms62hv6hli2m", "content": "Oldest CVEs in this batch: CVE-2008-4128 (Cisco), CVE-2021-27137 (DD-WRT).", "creation_timestamp": "2026-08-03T08:13:08.002591Z"}, {"uuid": "06da6e3e-3e39-486d-b6e5-909660a5c3d8", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/shortinfo.bsky.social/post/3mtbanzjstn2v", "content": "Oldest CVEs in this batch: CVE-2021-27137 (DD-WRT).", "creation_timestamp": "2026-08-17T08:07:07.157863Z"}, {"uuid": "1c1cf615-6580-4be5-9d3e-b5ee02a3e847", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://infosec.exchange/users/VirusBulletin/statuses/116691019017195575", "content": "Vincent Li at FortiGuard Labs analyses C0XMO, a new Gafgyt variant discovered in March 2026 that spreads by exploiting CVE-2021-27137. A key change is the separation of lateral movement into a standalone Python script, helping the botnet target multiple architectures and device types. https://www.fortinet.com/blog/threat-research/inside-cross-platform-propagation-of-new-gafgyt-variant-c0xmo", "creation_timestamp": "2026-06-04T09:00:51.199952Z"}, {"uuid": "892f8cd5-f027-4216-a9f4-820c5d13baeb", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/virusbtn.bsky.social/post/3mnhb5w3wbk2o", "content": "Vincent Li at FortiGuard Labs analyses C0XMO, a new Gafgyt variant that spreads by exploiting CVE-2021-27137. A key change is the separation of lateral movement into a standalone Python script, helping the botnet target multiple architectures and device types. www.fortinet.com/blog/threat-...", "creation_timestamp": "2026-06-04T09:00:52.029145Z"}, {"uuid": "0db5a276-5700-44ef-a0a4-ed1c0f59eb86", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/hendryadrian.bsky.social/post/3mnj5ifvhld2l", "content": "FortiGuard Labs found C0XMO, a modular Gafgyt variant exploiting CVE-2021-27137 on DD-WRT routers, using Python scanning to spread across Linux and IoT devices with persistence and DDoS features. #C0XMO #Gafgyt #DDWRT", "creation_timestamp": "2026-06-05T03:00:26.524345Z"}, {"uuid": "0ff28e04-7384-4ba6-8379-84881a799956", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/hendryadrian.bsky.social/post/3mnpqpkmbya2x", "content": "C0XMO, a modular Gafgyt botnet, targets DD-WRT routers via CVE-2021-27137, brute-forces weak SSH/Telnet logins, and kills rival malware while spreading across many device architectures. #C0XMO #Gafgyt #DDWRT", "creation_timestamp": "2026-06-07T18:00:26.647208Z"}, {"uuid": "220ff201-319d-45fa-b93a-c0d64ec6e6fb", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "cve-2021-27137", "type": "seen", "source": "https://bsky.app/profile/ahmandonk.bsky.social/post/3mnqwigyq2f24", "content": "\ud83d\udcf0 Botnet C0XMO Meluas Lewat Celah DD-WRT: Luncurkan Serangan DDoS dan Basmi Malware Pesaing\n\n\ud83d\udc49 Baca artikel lengkap di sini: https://ahmandonk.com/2026/06/08/botnet-c0xmo-serang-router-dd-wrt-dan-hapus-malware-pesaing/\n\n#botnetC0xmo #cve-2021-27137 #dd-wrt #fortinet #gafgyt #keamananSiber #mal", "creation_timestamp": "2026-06-08T05:16:28.674906Z"}, {"uuid": "f29e11e4-a0a7-443e-8ccd-6f6c5a6968ca", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "MISP/297905e4-0013-43d5-9bfe-ad728dc8cf58", "content": "", "creation_timestamp": "2026-06-11T10:57:44.000000Z"}, {"uuid": "327ed30b-286b-445e-a738-effd58181f54", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/shortinfo.bsky.social/post/3mspnhhhkyz2m", "content": "Oldest CVEs in this batch: CVE-2008-4128 (Cisco), CVE-2021-27137 (DD-WRT).", "creation_timestamp": "2026-08-10T08:08:10.522516Z"}, {"uuid": "f31f94c4-bf39-4e2e-a6fd-3286687faa79", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/getpokemon7.bsky.social/post/3mtlvkbh6is2i", "content": "\u7c73\u30b5\u30a4\u30d0\u30fc\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5e81\uff08CISA\uff09\u306f\u3001DD-WRT\u3001Langflow\u3001WordPress\u306e\u8106\u5f31\u6027\u3092\u65e2\u77e5\u306e\u60aa\u7528\u3055\u308c\u305f\u8106\u5f31\u6027\u30ab\u30bf\u30ed\u30b0\u306b\u8ffd\u52a0\u3057\u305f\u3002\n\n\u7c73\u56fd\u306e\u30b5\u30a4\u30d0\u30fc\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30fb\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5e81\uff08CISA\uff09 \u306f\u3001DD-WRT\u3001Langflow\u3001WordPress\u306e\u8106\u5f31\u6027\u3092\u65e2\u77e5\u306e\u60aa\u7528\u3055\u308c\u305f\u8106\u5f31\u6027\uff08KEV\uff09\u30ab\u30bf\u30ed\u30b0\u306b\u8ffd\u52a0\u3057\u305f\u3002\n\n\u4ee5\u4e0b\u306f\u3001KeV\u30ab\u30bf\u30ed\u30b0\u306b\u8ffd\u52a0\u3055\u308c\u305f\u4e0d\u5177\u5408\u3067\u3059\u3002\n\nCVE-2021-27137  \uff08CVSS\u30b9\u30b3\u30a28.1\uff09DD-WRT\u30b9\u30bf\u30c3\u30af\u30d9\u30fc\u30b9\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u8106\u5f31\u6027\nCVE-2026-0770  \uff08CVSS\u30b9\u30b3\u30a29.8\uff09...", "creation_timestamp": "2026-08-21T13:47:29.057580Z"}, {"uuid": "8ec62e2b-6333-4a19-9fdb-480484a801ff", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/getpokemon7.bsky.social/post/3mti6hy6gdc2k", "content": "CISA Adds Four Known Exploited Vulnerabilities to Catalog\nRelease Date July 21, 2026\n\nCVE-2021-27137 DD-WRT Stack-Based Buffer Overflow Vulnerability\nCVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability  \nCVE-2026-63030 WordPress Core Interpretation Confli...", "creation_timestamp": "2026-08-20T02:16:35.831682Z"}, {"uuid": "bab7d94d-69de-4c65-8571-a3025be69b6e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/cve.skyfleet.blue/post/3mqrwzmanf62c", "content": "CVE-2021-27137 - DD-WRT UPnP Buffer Overflow\nCVE ID : CVE-2021-27137\n \n Published : July 16, 2026, 6:16 p.m. | 18\u00a0minutes ago\n \n Description : An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows a...", "creation_timestamp": "2026-07-16T19:14:18.987234Z"}, {"uuid": "894ae1ee-226d-40d3-bf27-9f247e5f95ad", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/cvesentinel.bsky.social/post/3mr62lvr2v72h", "content": "\ud83d\uded1 CVE-2021-27137\nDD-WRT DD-WRT\nCVSS 8.1 / EPSS 5% / KEV: No\nTL;DR: An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in\u2026\nhttps://cvesentinel.com/report/CVE-2021-27137?utm_source=bluesky&utm_medium=social&utm_campaign=cvesentinel\n#infosec #CVE #vulnerability", "creation_timestamp": "2026-07-21T14:50:11.019405Z"}, {"uuid": "fe23a167-8dc1-4efe-a801-1f7e99a7fae9", "vulnerability_lookup_origin": "405284c2-e461-4670-8979-7fd2c9755a60", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "exploited", "source": "https://vulnerability.circl.lu/known-exploited-vulnerabilities-catalog/1b340c4a-eaac-42b6-993b-564939a9e72a", "content": "", "creation_timestamp": "2026-07-21T15:00:01.889225Z"}, {"uuid": "20806e11-1e64-430a-b5b0-0b591f7a2751", "vulnerability_lookup_origin": "caeb2787-0d58-4236-9039-7c86c3e566f3", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "exploited", "source": "https://vulnerability.circl.lu/known-exploited-vulnerabilities-catalog/0912e7a5-8931-4840-b5b7-3ea958a72576", "content": "", "creation_timestamp": "2026-07-21T15:00:38.953783Z"}, {"uuid": "7e990f38-6b6e-4381-b108-364459e1ac90", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "86ecb4e1-bb32-44d5-9f39-8a4673af8385", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://www.cisa.gov/news-events/alerts/2026/07/21/cisa-adds-four-known-exploited-vulnerabilities-catalog", "content": "", "creation_timestamp": "2026-07-21T16:15:02.833114Z"}, {"uuid": "5f772955-3199-479e-8e2d-f0c54a9e4082", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/happeningnow.news/post/3mr6akwgum72q", "content": "CISA Adds Four Known Exploited Vulnerabilities to Catalog\nCISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog , based on evidence of active exploitation. CVE-2021-27137 DD-WRT Stack-Based Buffer\u2026\n\n\ud83d\udd17 https://hnow.live/a/6a256aaf", "creation_timestamp": "2026-07-21T16:37:00.571360Z"}, {"uuid": "2bb70070-d375-4b7c-94fd-8499907440fc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/cyberhub.blog/post/3mr7agdtno72s", "content": "\ud83d\udccc CVE-2021-27137 - An issue was discovered in router/upnp/src/ssdp.c in DD-WRT before 45724. An unsafe strcpy in the UPnP handling functionality allows an unauthenticate... https://www.cyberhub.blog/cves/CVE-2021-27137", "creation_timestamp": "2026-07-22T02:07:06.893277Z"}, {"uuid": "42ebf7f5-fecd-4e44-9d0b-8d3951fe5714", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/thecybermind.co/post/3mr7giaghtj24", "content": "\u26a0\ufe0f CRITICAL THREAT: CVE-2021-27137 in DD-WRT allows unauthenticated remote code execution via UPnP. With active exploitation verified, edge defense is critical. Get the forensic detection and hardening strategies you need to secure your infrastructure. #CyberSecurity #InfoSec #DDWRT\u2026", "creation_timestamp": "2026-07-22T03:55:33.338101Z"}, {"uuid": "59278417-b127-438a-8b57-83148b22e2a3", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/termsofsurrender.bsky.social/post/3mr7joxowrf2g", "content": "DD-WRT Bleeds Out While The Bureaucracy Checks The Fax Tray\nPANIC 82% | Lag 0.0h | DD-WRT is affected by CVE-2021-27137, a stack-based buffer overflow that can allow unauthenticated r\n#AfterShockIndex\nREAD MORE", "creation_timestamp": "2026-07-22T04:53:00.030868Z"}, {"uuid": "c0bfe1d6-1fa7-43b6-bb17-f2c3dc4c00b3", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://mastodon.social/ap/users/115426718704364579/statuses/116964653150323533", "content": "\ud83d\udcf0 CISA Adds Four Actively Exploited Flaws in DD-WRT, Langflow, WordPress\nCISA adds 4 actively exploited vulnerabilities to its KEV catalog: CVE-2021-27137 (DD-WRT), CVE-2026-0770 (Langflow), and CVE-2026-63030 & CVE-2026-60137 (WordPress). Patching is urgent. #CISA #KEV #Vulnerability #PatchNow #WordPress\n\ud83c\udf10 cyber[.]netsecops[.]io\n\ud83d\udd17 https://cyber.netsecops.io/articles/cisa-adds-four-actively-exploited-vulnerabilities-in-dd-wrt-langflow-wordpress-to-kev-catalog/?utm_s\u2026", "creation_timestamp": "2026-07-22T16:49:32.001199Z"}, {"uuid": "6a64e3b4-36e9-441b-bb81-6d078c1c7d42", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "seen", "source": "https://bsky.app/profile/netsecio.bsky.social/post/3mrarr25fd22q", "content": "CISA adds 4 actively exploited vulnerabilities to its KEV catalog: CVE-2021-27137 (DD-WRT), CVE-2026-0770 (Langflow), and CVE-2026-63030 & CVE-2026-60137 (WordPress). Patching is urgent. #CISA #KEV #Vulnerability #PatchNow #WordPress\n\n\ud83c\udf10 cyber[.]netsecops[.]io", "creation_timestamp": "2026-07-22T16:49:59.647852Z"}, {"uuid": "dd45627b-1267-438e-9b21-37fe98d7df4f", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-27137", "type": "exploited", "source": "https://t.me/VulnerabilityNews/43589", "content": "CISA Adds Four Known Exploited Vulnerabilities to Catalog \n\nCISA has added four new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation.\nCVE-2021-27137 DD-WRT Stack-Based Buffer Overflow Vulnerability\nCVE-2026-0770 Langflow Inclusion of Functionality from Untrusted Control Sphere Vulnerability \u00a0\nCVE-2026-63030 WordPress Core Interpretation Conflict Vulnerability \u00a0\nCVE-2026-60137 WordPress Core SQL Injection Vulnerability\nThese types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise.\nBinding Operational Directive (BOD) 26-04: Prioritizing Security Updates Based on Risk establishes vulnerability management requirements for Federal Civilian Executive Branch (FCEB) agencies. BOD 26-04 reinforces the importance of the KEV Catalog and requires federal agencies to prioritize rapid remediation of high-risk vulnerabilities, specifically those identified by Common Vulnerabilities and Exposures (CVEs) listed in CISA\u2019s KEV Catalog on publicly exposed assets that grant total control of the asset post-exploitation, while deferring action for lower-risk vulnerabilities. BOD 26-04 further establishes basic expectations for when agencies must check whether threat actors compromised the system before the patch was applied.\nWhile BOD 26-04 applies only to FCEB agencies, CISA encourages all organizations to adopt risk-based vulnerability management and prioritize remediation of KEV Catalog vulnerabilities. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.\nAware of an exploited vulnerability not currently listed in the KEV Catalog? Submit it for potential addition through CISA\u2019s KEV Nomination Form. Potential KEV additions must have a CVE ID, evidence of exploitation, and clear mitigation guidance.\nhttps://www.cisa.gov/news-events/alerts/2026/07/21/cisa-adds-four-known-exploited-vulnerabilities-catalog", "creation_timestamp": "2026-09-18T08:00:06.066507Z"}]}