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joern

@jrn.bsky.social
461 followers 146 following 46 posts

Still your mom’s favorite hacker!

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joern @jrn.bsky.social · 27/06/2026
Looking forward to this! Brace for TOP INSIGHTS (which is still an anagram of SHITPOSTING).
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joern @jrn.bsky.social · 14/03/2026
RIP FX We collected some texts from the community in memory of @fxv2.bsky.social . You can find them here phenoelit.de/fx.html
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joern @jrn.bsky.social · 02/03/2026
Lands of Packets TTL exceeded. I would like to collect texts from the scene about FX in his memory. A collection of obituaries that will then be posted on phenoelit.de. If anyone would like to contribute, please contact me. Mail: joernchen@phenoelit.de Signal: jrn.07
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joern @jrn.bsky.social · 19/08/2025
Today I have a more serious topic than usual, please consider reposting for reach: My wife and I are urgently looking for a specialist in neuropediatrics or a similar field for our autistic child with a diagnosed, but not further specified, movement disorder [1/4]
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Felladonna @langsec.hacker.gf · 21/05/2025
you might find inspiration in joern's recent offensivecon talk. slides are at 0day.click/parser-diff-..., video at www.youtube.com/watch?v=Dq_K...
youtube.com
OffensiveCon25 - Joernchen - Parser Differentials: When Interpretation Becomes a Vulnerability
YouTube video by OffensiveCon
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joern @jrn.bsky.social · 12/05/2025
Cross functional steakholder or something, no clue I don’t eat meat…
cross functional steakholder: a steak with some kind of metal handle and a screwdriver or so coming out of it
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joern @jrn.bsky.social · 29/04/2025
thanks AI
ai generated pic:

password spray in the style of wd-40
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Reposted by joern
OffensiveCon @offensivecon.bsky.social · 25/04/2025
2025 agenda is out! www.offensivecon.org/agenda/2025....
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joern @jrn.bsky.social · 25/04/2025
Parser Differentials have become pretty much my favorite bug class over the last years. I am absolutely honored to get the chance to present on this topic at @offensivecon.bsky.social in a few weeks. www.offensivecon.org/speakers/202...
offensivecon.org
joernchen | OffensiveCon
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joern @jrn.bsky.social · 13/04/2025
Felt cute, might delete later www.instagram.com/p/DIZOJDeMZ8-/
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joern @jrn.bsky.social · 16/03/2025
Silence debugger

A printf("XXX") is talking 

meme
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joern @jrn.bsky.social · 02/02/2025
deepsigh for deepseek openwebui.com/c/jrnjrn/c38...
openwebui.com
deepseek-r1:8b fizz buzz | Open WebUI Community
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Andrea @valkyrie.hacker.gf · 06/01/2025
Would you give an LLM control of the nukes if it would stop Donald Trump from taking office and getting it instead?
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joern @jrn.bsky.social · 04/01/2025
Have a great weekend and enjoy some tunes: youtu.be/j_Md8_7mhOU
youtu.be
joernchen - Friday 13th @ 1°C
YouTube video by Tiny Club Berlin
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joern @jrn.bsky.social · 01/01/2025
What a year, huh?
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joern @jrn.bsky.social · 28/12/2024
A wild @phrack.org print edition appears 🤩🤩🤩
Print issue of Phrack #71
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joern @jrn.bsky.social · 21/12/2024
Happy Holidays! I hope Vulnsanta has some CVE in his bag for you!
Me with a Santa hat and a bag which has the CVE logo on it.
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Filippo Valsorda @filippo.abyssdomain.expert · 21/12/2024
I don’t know who needs to hear it but defaults write com.google.Chrome URLBlocklist -array-add example.com works system-wide without giving access to all your browsing to some extension.
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joern @jrn.bsky.social · 05/12/2024
OK cool, who needs fuzzers when you can segfault ImageMagick's convert with normal use.
➜  Videos convert wordz.gif wordz.mp4
[libx264 @ 0x5fc1ee3a6680] height not divisible by 2 (1096x789)
[vost#0:0/libx264 @ 0x5fc1ee3ac880] Error while opening encoder - maybe incorrect parameters such as bit_rate, rate, width or height.
Error while filtering: Generic error in an external library
Segmentation fault (core dumped)
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joern @jrn.bsky.social · 05/12/2024
A little challenge for you all gitlab.com/joernchen/jo...
gitlab.com
Shellwordz ($4776755) · Snippets · Joern Schneeweisz / joernchen · GitLab
GitLab.com
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joern @jrn.bsky.social · 30/11/2024
Well, if you feel a bounty is not high enough you can always resort to extortion or ransomware. 🤡
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joern @jrn.bsky.social · 17/11/2024
Infosuck comic:

Remember when writing clientside exploits was lame?
I robbed a bank through XSS the other week.
I hate myself.
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dmnk @dmnk.bsky.social · 15/11/2024
Slides for my @ekoparty talk "Advanced Fuzzing With LibAFL" - > docs.google.com/presentation...
docs.google.com
Advanced Fuzzing With LibAFL @ Ekoparty 2024
Advanced Fuzzing With LibAFL Dominik Maier Ekoparty 2024-11-15 1
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joern @jrn.bsky.social · 16/11/2024
Post a pic YOU took (no description) to bring some zen to the timeline
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joern @jrn.bsky.social · 13/11/2024
TTL extension
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joern @jrn.bsky.social · 30/12/2023
ping
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evacide @evacide.bsky.social · 26/08/2023
I am glad that people who enjoy management exist so that I don't have to do it.
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joern @jrn.bsky.social · 17/07/2023
Considering giving a talk titled: „I made my hobby my profession so I needed a new hobby. Now I’m cuddling grown men in pyjamas trying to choke them out or break their limbs - for fun“
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argp @argp.bsky.social · 03/07/2023
:( @jrn.bsky.social reminded me of infosuck, not that I needed reminding, but still I re-read everything again and it couldn't be more relevant: web.archive.org/web/20131202231402/…
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joern @jrn.bsky.social · 03/06/2023
Popped a shell or two on hg.mozilla.org read about some funky LDAP truncation at 0day.click/recipe/pash
0day.click
RCE via LDAP truncation on hg.mozilla.org :: 0day.click
Given my interest in SCM and CI systems I was a little keen to see how this is done at Mozilla as part of thier bug bounty program. Thanks to freddy I was granted Level 1 access to Mozilla’s SCM...
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joern @jrn.bsky.social · 17/05/2023
Unpopular take: .zip domains were a marketing gag targeting security people.
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Butt teeth! Butt teeth! Butt teeth! @panic.gay · 12/05/2023
Gonna start calling ChatGPT's hyper-authoritative way of writing completely false information the Turing-Kruger effect
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joern @jrn.bsky.social · 10/05/2023
Hi I’m new here. Where’s the good shitposting on this site?
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