CVE-2021-42697

EPSS 36.1%

Vexday Risk Score

35Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Popular PoC on GitHub (1 stars) — exploitation code widely available.

CVSS —EPSS 36.1%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

02 Nov 2021Published on NVD

24 Apr 2022Public PoC

Weaponization speed

172 daysto first PoC

Recommendation: Plan a near-term fix — a public PoC already exists.

Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments.

Affected products

n/a · n/a

public PoCs found — 3

githubgithub.com/cxosmo/CVE-2021-42697★ 1 cve_referencepacketstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.htmlunverified exploitdbwww.exploit-db.com/exploits/50892unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html https://akka.io/blog/https://akka.io/blog/news/2021/11/02/akka-http-10.2.7-released https://akka.io/blog/news/2021/11/22/akka-http-10.1.15-released https://doc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html